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		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
dei: Entity Common Stock Shares Outstanding		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Weighted Average Number Of Diluted Shares Outstanding		31.41	NA	32.75	32.81	0.03	NA	33.68	33.62	34.27	NA	32.61	31.25	29.18	NA	27.13	27.63	31.01	31.90	31.71	31.58	31.09	30.81	30.78	30.53	30.57	29.25	29.25	29.19	29.02	28.86	29.30	28.83	28.49	29.32	29.13	28.91	27.82	28.43	29.35	29.21	29.38	29.68	29.65	29.29	28.29	27.29	27.66	28.06	27.94	28.47	28.92	28.61	28.96	NA	NA	28.52
Weighted Average Number Of Shares Outstanding Basic		31.03	NA	32.52	32.58	0.03	NA	33.20	33.62	34.00	NA	32.47	30.98	28.58	NA	26.90	27.63	31.01	31.73	31.71	31.58	31.09	30.81	30.78	30.53	29.70	29.25	29.25	29.19	29.02	28.86	28.85	28.83	28.49	28.30	28.19	28.07	27.82	27.73	28.50	28.38	28.37	28.61	28.56	28.15	27.42	27.29	27.66	28.06	27.94	28.47	28.92	28.61	28.25	NA	NA	28.10
Earnings Per Share Basic		0.60	0.49	0.08	0.22	0.25	0.59	0.23	-0.05	0.15	0.04	0.12	0.17	0.07	0.28	0.11	-0.03	-0.16	0.03	-0.04	-0.27	-0.35	-0.10	-0.15	-0.25	2.35	-0.42	-0.18	-0.51	-0.44	-1.32	0.24	-0.20	-0.09	0.04	0.01	0.06	0.00	0.04	0.04	0.01	0.07	1.31	0.04	0.03	0.08	-0.01	-0.11	-0.08	-0.01	-0.01	-0.05	-0.05	0.05	NA	NA	0.01
Earnings Per Share Diluted		0.59	0.49	0.08	0.21	0.25	0.60	0.23	-0.05	0.15	0.03	0.12	0.17	0.07	0.28	0.11	-0.03	-0.16	0.03	-0.04	-0.27	-0.35	-0.10	-0.15	-0.25	2.29	-0.42	-0.18	-0.51	-0.44	-1.32	0.24	-0.20	-0.09	0.04	0.01	0.06	0.00	0.04	0.04	0.01	0.06	1.26	0.04	0.03	0.08	-0.01	-0.11	-0.08	-0.01	-0.01	-0.05	-0.05	0.05	NA	NA	0.01

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Revenue From Contract With Customer Excluding Assessed Tax		43.85	10.38	9.48	6.98	7.07	9.16	14.01	7.98	7.31	9.75	7.17	11.01	7.16	10.94	7.60	5.67	6.26	11.46	10.62	8.74	5.12	10.87	8.55	6.14	85.42	6.90	11.86	7.03	9.22	9.29	26.31	7.86	13.62	16.57	14.31	16.22	16.29	13.62	12.05	11.83	15.44	12.07	11.34	10.20	13.86	8.86	7.14	6.48	9.69	7.69	6.50	6.68	9.77	6.39	6.55	8.47
Revenues		43.85	10.38	9.48	6.98	7.07	9.16	14.01	7.98	7.31	9.75	7.17	11.01	7.16	10.94	7.60	5.67	6.26	11.46	10.62	8.74	5.12	10.87	8.55	6.14	85.42	6.90	11.86	7.03	9.22	9.29	26.31	7.86	13.62	16.57	14.31	16.22	16.29	13.62	12.05	11.83	15.44	12.07	11.34	10.20	13.86	8.86	7.14	6.48	9.69	7.69	6.50	6.68	9.77	6.39	6.55	8.47
Gain Loss On Investments		5.29	12.13	-4.58	4.95	4.30	6.84	-3.52	-7.11	0.74	-1.38	0.50	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Operating Expenses		27.23	5.34	2.96	NA	3.81	3.38	3.08	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	14.41	13.71	14.44	15.31	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Research And Development Expense		0.04	0.02	0.03	0.10	0.13	0.26	0.25	0.35	0.51	0.71	0.80	1.33	1.31	1.08	0.92	1.32	1.69	1.77	1.93	1.83	2.30	2.58	2.11	2.22	2.82	2.62	3.12	2.83	3.20	3.16	2.95	2.97	4.31	4.09	3.47	3.50	3.73	3.01	2.72	3.01	3.06	3.01	2.64	2.66	2.57	2.02	2.09	2.12	2.19	1.86	2.18	2.24	2.10	2.27	2.01	2.00
General And Administrative Expense		25.85	4.43	2.57	3.37	3.59	2.89	2.54	3.30	2.71	2.73	2.25	2.64	2.22	3.65	2.96	4.09	7.36	7.61	8.22	14.45	12.70	10.15	9.88	10.55	11.24	11.46	10.75	15.60	15.53	13.41	9.65	11.00	10.09	7.50	6.24	6.72	8.29	6.01	5.27	5.95	6.52	8.46	4.53	3.98	6.14	4.44	5.75	4.36	4.77	3.20	3.19	3.06	3.11	3.23	3.01	3.08
Selling And Marketing Expense		1.34	0.89	0.37	0.40	0.10	0.23	0.28	0.22	0.49	0.50	0.44	1.19	1.11	0.93	1.10	1.25	1.72	1.55	1.69	1.58	1.61	1.66	1.66	1.57	1.22	3.37	3.38	3.46	3.31	3.88	3.54	3.40	3.80	3.60	3.20	3.67	4.21	3.26	2.24	2.64	2.76	2.65	2.15	2.29	2.25	1.70	1.63	1.69	1.75	1.68	1.64	1.91	1.85	1.96	1.81	1.91
Operating Income Loss		16.61	5.04	6.52	3.11	3.26	5.78	10.93	4.11	3.60	5.80	3.67	5.81	2.49	5.24	2.58	-1.06	-4.55	0.48	-1.27	-9.15	-11.50	-3.55	-5.16	-8.29	70.11	-12.22	-5.44	-14.91	-12.85	-11.21	10.11	-9.56	-4.61	1.29	1.28	2.22	-0.07	1.19	1.70	0.12	2.95	0.65	1.42	0.76	2.26	-0.17	-2.94	-2.31	0.32	0.23	-1.04	-1.11	1.88	-1.96	-0.95	0.51
Interest Income Expense Net		8.11	NA	-2.55	6.76	6.53	NA	-2.35	-6.10	2.03	NA	0.44	0.04	-0.32	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Income Tax Expense Benefit		6.07	3.30	1.28	2.84	1.51	-4.96	0.88	-0.17	0.56	3.82	0.34	0.51	0.14	-2.24	-0.10	0.04	0.05	0.27	0.09	-0.00	0.12	0.08	0.02	-0.16	0.45	0.18	0.04	0.10	0.15	26.79	3.76	-3.32	-1.70	-0.06	1.01	0.67	-0.04	0.42	0.60	0.09	1.08	-36.77	0.26	0.01	0.02	0.06	0.12	0.07	0.55	0.53	0.43	0.27	0.59	0.40	0.34	0.42
Income Taxes Paid Net		0.03	0.91	0.25	0.62	0.02	0.75	0.01	0.63	0.02	0.00	0.07	0.00	0.01	0.00	0.04	0.00	0.02	0.06	0.08	0.00	0.02	0.01	0.06	-0.01	0.09	0.06	0.02	0.07	0.04	0.01	0.05	0.06	-0.53	0.02	0.05	0.02	0.07	0.00	0.02	-0.00	0.03	0.01	0.01	-0.01	0.01	0.00	0.00	0.01	0.01	0.00	0.02	0.03	-3.35	-0.04	0.00	NA
Net Income Loss		18.66	15.99	2.68	7.03	8.28	19.70	7.71	-1.82	5.08	1.34	3.77	5.34	2.04	8.09	2.85	-0.71	-4.83	0.98	-1.39	-8.62	-11.02	-3.14	-4.64	-7.76	69.88	-12.29	-5.29	-14.85	-12.87	-38.15	7.02	-5.56	-2.69	1.14	0.18	1.59	-0.06	1.02	1.07	0.17	1.86	37.40	1.21	0.78	2.25	-0.20	-2.99	-2.15	-0.22	-0.27	-1.41	-1.31	1.39	-2.32	-1.13	0.18
Comprehensive Income Net Of Tax		18.48	16.50	3.00	7.33	8.65	19.96	8.05	-2.87	5.32	1.09	4.30	5.34	2.04	8.09	2.85	-0.71	-4.83	0.97	-1.39	-8.60	-11.01	-3.13	-4.64	-7.75	69.89	-12.30	-5.28	-14.85	-12.89	-38.15	7.00	-5.53	-2.66	1.11	0.19	1.60	-0.06	1.00	1.08	0.17	1.86	35.92	1.22	0.78	2.25	-0.20	-2.98	-2.15	-0.24	-0.29	-1.42	-1.29	1.39	NA	NA	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Assets		244.70	215.73	204.68	202.49	197.12	190.11	171.22	174.02	180.86	175.52	160.52	141.95	136.41	96.13	87.44	85.62	107.49	124.85	127.74	135.04	148.48	146.00	146.69	151.04	155.34	51.98	59.77	70.78	83.20	103.77	137.62	101.16	105.45	105.42	108.60	113.82	118.63	97.52	104.09	114.16	120.01	110.58	84.13	83.60	85.79	63.44	67.50	72.92	77.81	74.68	80.94	82.24	NA	80.88	NA	NA
Liabilities		43.25	32.63	35.25	32.46	31.39	32.41	28.06	34.28	37.51	34.23	29.73	30.22	31.11	32.15	33.42	35.89	39.74	41.09	43.31	51.33	57.55	46.34	46.30	49.08	50.06	42.32	39.92	46.81	45.61	48.43	45.94	17.34	17.43	18.80	24.21	31.85	40.09	20.92	26.64	34.50	42.45	29.90	25.30	27.64	36.08	18.80	23.06	23.21	24.81	23.06	23.67	24.78	NA	27.19	NA	NA
Liabilities And Stockholders Equity		244.70	215.73	204.68	202.49	197.12	190.11	171.22	174.02	180.86	175.52	160.52	141.95	136.41	96.13	87.44	85.62	107.49	124.85	127.74	135.04	148.48	146.00	146.69	151.04	155.34	51.98	59.77	70.78	83.20	103.77	137.62	101.16	105.45	105.42	108.60	113.82	118.63	97.52	104.09	114.16	120.01	110.58	84.13	83.60	85.79	63.44	67.50	72.92	77.81	74.68	80.94	82.24	NA	80.88	NA	NA
Stockholders Equity		201.46	183.10	169.43	170.04	165.73	157.70	143.15	139.74	143.35	141.29	130.79	111.73	105.30	63.98	54.01	49.73	67.74	83.76	84.43	83.71	90.93	99.66	100.40	101.96	105.27	9.66	19.85	23.96	37.59	55.34	91.68	83.81	88.02	86.61	84.39	81.98	78.54	76.60	77.45	79.66	77.56	80.67	58.84	55.97	49.70	44.64	44.44	49.71	53.01	51.62	57.27	57.46	NA	53.68	NA	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Assets Current		193.84	172.45	160.84	168.02	159.06	160.32	144.62	148.34	160.36	153.32	134.54	122.13	115.87	74.35	67.28	64.68	91.09	106.96	109.46	114.82	127.89	135.82	139.53	143.53	147.25	48.08	55.58	66.34	78.61	94.03	101.15	60.88	68.26	68.93	74.60	87.68	90.22	70.60	74.99	84.42	90.45	80.18	65.98	65.91	68.32	46.44	50.62	56.47	61.69	58.89	65.89	67.58	NA	66.59	NA	NA
Cash		13.93	14.84	5.82	5.27	7.97	9.63	15.57	37.39	NA	51.49	90.60	36.70	32.00	13.90	10.30	8.50	15.70	23.13	23.40	41.40	31.80	29.60	25.70	29.90	62.90	23.50	13.10	17.10	14.00	24.80	28.00	14.30	14.80	11.00	11.10	18.60	15.80	2.90	3.10	4.70	3.80	4.10	4.60	3.80	22.20	4.50	4.30	3.80	NA	3.70	NA	NA	NA	NA	NA	NA
Cash And Cash Equivalents At Carrying Value		91.10	56.07	28.70	25.82	27.48	48.82	36.77	57.39	62.96	51.49	90.60	107.27	102.62	59.52	55.96	54.10	76.23	86.48	86.58	92.61	102.65	110.99	112.63	116.44	119.13	24.62	19.26	33.15	43.11	56.87	61.97	20.33	20.88	25.01	33.17	52.64	40.35	14.38	10.14	17.22	24.36	14.14	16.66	6.90	30.22	4.56	13.89	8.40	8.59	7.30	14.51	15.90	16.22	12.24	13.13	14.99
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents		91.10	56.07	28.70	25.82	27.48	48.82	36.77	57.39	62.96	51.49	90.60	107.27	102.62	59.52	55.96	54.10	76.23	86.48	86.58	92.61	102.65	110.99	112.63	116.44	119.13	24.62	NA	NA	NA	56.87	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Short Term Investments		88.01	104.29	122.00	131.72	120.92	100.92	96.78	NA	NA	86.43	NA	NA	NA	NA	NA	0.00	0.00	3.02	9.03	9.00	14.96	13.93	17.84	20.25	19.84	21.92	28.86	28.86	32.87	32.91	32.93	35.93	39.93	39.92	33.99	19.00	37.99	42.98	52.99	56.98	56.98	56.98	47.99	56.98	33.99	38.99	33.98	43.96	48.97	48.99	48.98	48.97	NA	48.96	NA	NA
Marketable Securities Current		53.67	62.98	76.53	89.38	78.98	73.42	69.48	79.48	83.53	86.43	28.03	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Accounts Receivable Net Current		1.41	1.74	1.96	0.63	0.49	1.00	2.02	1.27	1.12	1.24	3.24	2.19	1.40	1.62	0.85	1.24	5.13	2.97	1.49	4.41	0.97	0.65	0.94	0.61	2.28	0.46	5.99	2.93	1.53	1.08	2.87	1.20	4.39	0.94	0.86	0.67	1.53	2.71	2.47	0.84	0.35	0.32	0.04	0.46	2.84	1.53	0.90	2.33	NA	0.53	NA	NA	NA	NA	NA	NA
Other Assets Current		0.15	0.19	0.05	0.06	0.06	0.10	0.14	0.19	0.18	0.19	0.20	0.24	0.20	0.17	0.17	0.19	NA	0.02	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Prepaid Expense And Other Assets Current		8.70	9.85	7.59	8.13	8.93	9.35	7.73	9.55	11.79	13.43	11.74	11.94	11.21	12.61	9.95	8.79	9.28	14.08	11.99	8.24	8.77	9.86	7.80	5.82	5.62	0.74	0.98	0.99	0.73	2.88	3.00	2.94	2.68	2.79	3.02	2.13	0.60	0.84	1.08	1.09	0.55	0.69	0.87	0.94	0.52	0.71	0.77	0.74	0.42	0.48	0.70	0.62	NA	3.82	NA	NA
Equity Securities Fv Ni		NA	62.98	NA	NA	NA	73.42	NA	NA	NA	NA	28.03	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Available For Sale Securities Debt Securities		75.30	74.66	75.32	62.59	67.54	39.24	40.55	17.15	11.18	7.29	7.47	NA	NA	NA	NA	0.00	0.00	3.02	9.03	9.00	14.96	13.93	17.84	NA	NA	21.92	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Property Plant And Equipment Net		0.17	0.21	0.23	0.25	0.27	0.29	0.36	0.38	0.41	0.44	0.22	0.25	0.25	0.21	0.24	0.25	0.28	1.23	1.77	1.95	2.14	2.34	2.54	2.72	2.90	3.15	3.40	3.64	3.85	4.02	4.07	4.24	4.41	4.59	4.78	4.93	2.58	1.21	1.28	1.36	1.15	0.94	0.98	1.12	1.19	1.28	1.43	1.52	1.62	1.74	1.28	1.47	NA	1.93	NA	NA
Long Term Investments		40.96	33.35	29.86	20.25	25.60	17.04	18.52	NA	NA	7.29	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Other Assets Noncurrent		0.00	0.15	0.30	0.46	0.65	0.92	3.29	3.71	4.00	12.10	13.84	7.22	7.99	9.00	8.03	8.99	16.11	16.66	16.51	18.27	18.45	7.83	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Equity Securities Fv Ni		NA	62.98	NA	NA	NA	73.42	NA	NA	NA	NA	28.03	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Available For Sale Debt Securities Amortized Cost Basis		73.89	73.08	74.36	61.84	67.09	39.14	40.73	17.67	10.65	7.00	6.93	NA	NA	NA	NA	NA	NA	3.02	9.02	8.98	14.96	13.94	17.85	NA	NA	21.94	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Liabilities Current		30.11	19.31	25.82	21.86	19.60	19.35	13.78	19.45	21.31	16.63	10.72	9.77	9.22	8.78	8.49	9.34	11.72	11.82	13.43	20.03	24.86	15.35	13.73	15.35	15.02	19.10	15.65	21.48	19.26	21.02	17.52	15.05	15.47	15.19	19.47	25.41	33.15	12.58	17.17	23.57	30.02	15.94	16.54	18.08	25.74	7.80	11.26	10.65	11.55	9.37	8.86	9.16	NA	9.82	NA	NA
Accounts Payable Current		0.02	0.05	0.04	0.05	0.02	0.09	0.01	0.08	0.05	0.00	0.12	0.14	0.47	0.15	0.17	0.47	0.94	0.81	2.18	7.37	12.38	3.61	0.76	3.36	4.26	6.65	4.83	10.24	6.95	5.95	2.42	2.59	2.98	0.65	1.54	1.24	1.67	0.67	1.02	1.37	1.95	0.68	0.62	0.60	1.60	0.34	1.72	1.68	1.88	0.36	0.55	0.76	NA	0.39	NA	NA
Taxes Payable Current		7.79	1.73	6.96	6.71	4.16	2.70	NA	NA	NA	2.06	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Dividends Payable Current		1.50	1.49	0.99	1.00	1.01	4.21	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Other Liabilities Current		14.59	11.90	20.42	15.73	14.05	12.46	7.73	13.60	15.96	11.25	4.96	2.97	2.72	2.46	2.25	2.45	4.17	3.48	4.20	5.97	6.31	3.19	5.70	4.05	3.30	3.90	4.01	3.89	5.33	4.41	4.24	3.50	2.78	3.00	1.64	3.22	3.78	2.23	1.48	2.12	2.49	1.65	1.38	1.03	3.25	1.02	2.48	1.78	1.92	2.05	1.13	0.97	NA	1.49	NA	NA
Contract With Customer Liability Current		12.31	4.24	4.73	4.77	4.77	4.77	4.76	4.65	4.74	4.83	4.91	5.01	5.10	5.17	5.24	4.62	4.62	4.69	4.67	4.74	4.82	4.59	4.69	NA	NA	4.42	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Other Liabilities Noncurrent		4.92	4.93	0.34	0.35	0.34	0.43	0.48	0.49	0.71	0.90	1.15	1.44	1.71	2.04	2.50	2.98	3.30	3.32	3.07	3.35	3.61	0.79	1.16	1.19	1.37	0.92	0.94	0.96	0.99	1.01	0.93	0.88	0.84	1.10	0.75	0.70	0.63	0.51	0.45	0.48	0.50	0.53	0.55	0.57	0.60	0.62	0.58	0.60	0.59	0.24	0.46	0.48	NA	0.54	NA	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Stockholders Equity		201.46	183.10	169.43	170.04	165.73	157.70	143.15	139.74	143.35	141.29	130.79	111.73	105.30	63.98	54.01	49.73	67.74	83.76	84.43	83.71	90.93	99.66	100.40	101.96	105.27	9.66	19.85	23.96	37.59	55.34	91.68	83.81	88.02	86.61	84.39	81.98	78.54	76.60	77.45	79.66	77.56	80.67	58.84	55.97	49.70	44.64	44.44	49.71	53.01	51.62	57.27	57.46	NA	53.68	NA	NA
Common Stocks Including Additional Paid In Capital		322.31	322.18	322.75	322.87	322.85	322.71	326.10	325.35	324.48	323.30	313.88	299.12	298.04	258.76	256.88	255.45	254.08	253.29	252.19	250.08	248.70	246.41	243.11	240.44	235.44	228.05	225.94	224.45	223.23	221.10	219.11	217.51	216.18	212.12	210.94	208.71	206.87	204.88	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Retained Earnings Accumulated Deficit		-17.39	-36.04	-52.03	-54.71	-61.74	-70.02	-89.72	-97.42	-95.60	-100.68	-102.02	-105.79	-111.13	-113.16	-121.25	-124.11	-123.39	-118.56	-119.54	-118.16	-109.54	-98.52	-95.38	-91.16	-83.40	-171.62	-159.32	-154.03	-139.19	-119.33	-81.18	-88.20	-82.64	-79.95	-81.09	-81.27	-82.86	-82.81	-83.82	-84.90	-85.06	-86.93	-107.49	-108.69	-109.47	-111.72	-111.52	-108.53	-106.38	-106.16	-105.89	-104.47	NA	-104.55	NA	NA
Accumulated Other Comprehensive Income Loss Net Of Tax		1.53	1.70	1.20	0.88	0.58	0.20	-0.06	-0.40	0.65	0.41	0.65	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.13	0.14	0.12	0.12	0.11	0.11	0.10	0.10	0.10	0.09	0.09	0.12	0.12	0.14	0.12	0.09	0.11	0.11	0.10	0.10	0.12	0.11	0.11	0.11	0.12	0.10	0.11	0.11	0.11	0.10	0.10	0.12	0.14	0.14	NA	0.12	NA	NA
Treasury Stock Value		105.00	104.74	102.48	99.00	95.96	95.20	93.17	87.79	86.17	81.73	81.73	81.73	81.73	81.73	81.73	81.73	63.07	51.09	48.35	48.35	48.35	48.35	47.44	47.44	46.87	46.87	46.87	46.54	46.54	46.54	46.37	45.64	45.64	45.64	45.57	45.57	45.57	45.57	42.57	37.56	37.45	30.57	30.57	30.57	30.57	30.57	30.10	26.90	24.85	24.85	18.59	18.40	NA	18.40	NA	NA
Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value		1.08	0.87	0.82	0.76	0.95	0.76	0.73	0.79	1.14	0.34	0.41	1.05	0.53	1.32	1.34	1.36	0.73	1.09	1.19	1.08	2.10	-0.39	2.51	2.53	1.22	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Net Cash Provided By Used In Operating Activities		29.90	7.82	4.03	5.23	3.52	8.07	13.44	7.60	11.04	6.73	1.67	4.64	4.41	3.01	1.78	-3.45	-1.32	-3.23	-6.95	-16.34	-7.58	-5.62	-6.42	-4.24	86.20	-1.71	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	16.44	3.91	1.10	-3.52	19.66	-2.95	-0.33	-2.75	1.79	0.20	-0.95	-1.55	4.68	-0.55	-1.40	NA
Net Cash Provided By Used In Investing Activities		6.88	22.76	3.34	-3.00	-19.71	6.17	-28.86	-11.55	4.83	-54.91	-32.69	-0.03	-0.06	-0.01	-0.01	-0.01	2.98	5.86	-0.00	6.00	-0.94	3.99	2.47	-0.36	2.13	7.00	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	-0.31	-6.52	8.25	-24.13	4.23	-5.98	9.08	4.36	-1.40	-1.01	-0.91	-0.62	-0.76	-0.67	-0.48	NA
Net Cash Provided By Used In Financing Activities		-1.75	-3.21	-4.48	-3.90	-5.15	-2.19	-5.21	-1.61	-4.40	9.07	14.35	0.04	38.75	0.56	0.09	-18.67	-11.91	-2.74	0.93	0.30	0.18	-0.02	0.15	1.91	6.17	0.07	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	-5.90	0.07	0.41	4.34	1.77	-0.40	-3.26	-1.80	0.90	-6.40	0.47	1.85	0.07	0.34	0.02	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Net Cash Provided By Used In Operating Activities		29.90	7.82	4.03	5.23	3.52	8.07	13.44	7.60	11.04	6.73	1.67	4.64	4.41	3.01	1.78	-3.45	-1.32	-3.23	-6.95	-16.34	-7.58	-5.62	-6.42	-4.24	86.20	-1.71	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	16.44	3.91	1.10	-3.52	19.66	-2.95	-0.33	-2.75	1.79	0.20	-0.95	-1.55	4.68	-0.55	-1.40	NA
Net Income Loss		18.66	15.99	2.68	7.03	8.28	19.70	7.71	-1.82	5.08	1.34	3.77	5.34	2.04	8.09	2.85	-0.71	-4.83	0.98	-1.39	-8.62	-11.02	-3.14	-4.64	-7.76	69.88	-12.29	-5.29	-14.85	-12.87	-38.15	7.02	-5.56	-2.69	1.14	0.18	1.59	-0.06	1.02	1.07	0.17	1.86	37.40	1.21	0.78	2.25	-0.20	-2.99	-2.15	-0.22	-0.27	-1.41	-1.31	1.39	-2.32	-1.13	0.18
Increase Decrease In Accounts Payable		-0.03	0.00	-0.01	0.04	-0.07	0.07	-0.06	0.02	0.05	-0.12	-0.02	-0.31	0.30	-0.02	-0.30	-0.46	0.12	-1.38	-5.20	-5.00	8.76	2.85	-2.60	-0.90	-2.39	1.81	-5.40	3.29	1.00	3.55	-0.17	-0.39	2.33	-0.89	0.30	-0.31	0.89	-0.35	-0.34	0.07	0.61	0.20	-0.15	-0.82	1.11	-1.23	0.07	-0.15	1.30	-0.06	-0.22	-0.02	0.27	-0.59	-0.85	NA
Share Based Compensation		1.08	0.87	0.82	0.76	0.95	0.76	0.73	0.79	1.14	0.34	0.41	1.05	0.53	1.32	1.34	1.36	0.73	1.09	1.19	1.08	2.10	2.42	2.51	2.53	1.22	2.03	1.34	1.18	1.56	1.31	1.21	1.25	2.33	1.23	1.28	1.23	1.74	1.24	1.13	1.34	1.58	1.21	1.25	1.15	1.04	0.80	0.81	0.82	0.72	0.85	0.94	0.98	0.78	0.98	0.90	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Net Cash Provided By Used In Investing Activities		6.88	22.76	3.34	-3.00	-19.71	6.17	-28.86	-11.55	4.83	-54.91	-32.69	-0.03	-0.06	-0.01	-0.01	-0.01	2.98	5.86	-0.00	6.00	-0.94	3.99	2.47	-0.36	2.13	7.00	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	-0.31	-6.52	8.25	-24.13	4.23	-5.98	9.08	4.36	-1.40	-1.01	-0.91	-0.62	-0.76	-0.67	-0.48	NA
Payments To Acquire Investments		40.91	18.98	58.58	44.81	54.95	20.21	59.14	35.18	36.78	74.97	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2024-03-31	2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Net Cash Provided By Used In Financing Activities		-1.75	-3.21	-4.48	-3.90	-5.15	-2.19	-5.21	-1.61	-4.40	9.07	14.35	0.04	38.75	0.56	0.09	-18.67	-11.91	-2.74	0.93	0.30	0.18	-0.02	0.15	1.91	6.17	0.07	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	-5.90	0.07	0.41	4.34	1.77	-0.40	-3.26	-1.80	0.90	-6.40	0.47	1.85	0.07	0.34	0.02	NA
Payments Of Dividends Common Stock		1.49	0.99	1.00	1.01	4.40	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Payments For Repurchase Of Common Stock		NA	2.08	3.33	NA	NA	1.96	5.22	1.61	4.44	NA	NA	NA	NA	0.00	0.00	18.67	11.97	NA	NA	0.00	0.00	0.00	NA	NA	NA	0.00	NA	NA	NA	0.00	NA	NA	NA	0.00	0.00	0.00	0.00	3.00	5.00	0.77	6.22	0.00	0.00	0.00	0.00	0.47	3.36	NA	NA	6.45	0.00	NA	NA	NA	NA	NA