Selected Quarterly Financial Data (unaudited) (Schedule Of Selected Financial Data) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended																12 Months Ended
	Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2009		Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Selected Quarterly Financial Data (unaudited)
Total revenues	$ 122,743		$ 121,917		$ 108,765		$ 90,420		$ 84,893		$ 83,006		$ 77,308		$ 75,192		$ 443,845	$ 320,399	$ 285,705
Gross profit	77,429		76,182		68,793		59,798		56,741		54,254		50,433		48,743		282,202	210,171	190,025
Income (loss) from continuing operations	2,407	[1]	(12,283)	[1]	(1,591)	[1]	8,484	[1]	3,491	[2]	3,650	[2]	5,035	[2]	1,049	[2]	(2,983)	13,225	1,656
Total discontinued operations	684		349		1,592		33,615		645		624		716		1,176		36,240	3,161	6,537
Net income	3,091	[1],[3]	(11,934)	[1],[3]	1	[1],[3]	42,099	[1],[3]	4,136	[2]	4,274	[2]	5,751	[2]	2,225	[2]	33,257	16,386	8,193
Income (loss) from continuing operations-basic	$ 0.02	[4]	$ (0.13)	[4]	$ (0.02)	[4]	$ 0.09	[4]	$ 0.04	[5]	$ 0.04	[5]	$ 0.06	[5]	$ 0.01	[5]	$ (0.03)	$ 0.15	$ 0.02
Discontinued operations, net of tax	$ 0.01	[4]	$ 0.00	[4]	$ 0.02	[4]	$ 0.38	[4]	$ 0.01	[5]	$ 0.01	[5]	$ 0.01	[5]	$ 0.02	[5]	$ 0.39	$ 0.04	$ 0.08
Net income (loss) per share-basic	$ 0.03	[4]	$ (0.13)	[4]	$ 0.00	[4]	$ 0.47	[4]	$ 0.05	[5]	$ 0.05	[5]	$ 0.07	[5]	$ 0.03	[5]	$ 0.36	$ 0.19	$ 0.10
Income (loss) from continuing operations	$ 0.02	[4]	$ (0.13)	[4]	$ (0.02)	[4]	$ 0.09	[4]	$ 0.04	[5]	$ 0.04	[5]	$ 0.06	[5]	$ 0.01	[5]	$ (0.03)	$ 0.15	$ 0.02
Discontinued operations, net of tax	$ 0.01	[4]	$ 0.00	[4]	$ 0.02	[4]	$ 0.36	[4]	$ 0.01	[5]	$ 0.01	[5]	$ 0.01	[5]	$ 0.02	[5]	$ 0.39	$ 0.03	$ 0.08
Net income (loss) per share-diluted	$ 0.03	[4]	$ (0.13)	[4]	$ 0.00	[4]	$ 0.45	[4]	$ 0.05	[5]	$ 0.05	[5]	$ 0.07	[5]	$ 0.03	[5]	$ 0.36	$ 0.18	$ 0.10
Litigation benefit													(7,000)					7,000
Restructuring costs (benefit)			13,396		231		(2,923)						8,579				10,704	8,579	10,157
Transaction costs					1,481		990		663								2,471	663
Tax accrual reversal							$ (3,942)						$ (3,089)					$ 3,089

[1] (1) Includes the following: Restructuring costs (benefit) $ — $ 13,396 $ 231 $ (2,923 ) Transaction costs — — 1,481 990

[2] (1) Includes the following: Litigation benefit $ — $ — $ (7,000 ) $ — Restructuring costs — — 8,579 — Tax accrual reversal — — (3,089 ) — Transaction costs 663 — — —

[3] (2) Includes the following: Tax accrual reversal $ — $ — $ — $ (3,942 )

[4] Earnings per share amounts for each quarter are computed using the weighted average number of shares outstanding during the quarter and earnings per share amounts for the full year are computed using the weighted average number of shares outstanding during the year. Therefore, the sum of earnings per share each quarter may not equal the full year amount.

[5] (2) Earnings per share amounts for each quarter are computed using the weighted average number of shares outstanding during the quarter and earnings per share amounts for the full year are computed using the weighted average number of shares outstanding during the year. Therefore, the sum of earnings per share each quarter may not equal the full year amount.