Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ (35,398)	$ 85,424	$ 24,368
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation	51,305	45,402	48,911
Depreciation and amortization	66,471	62,394	62,182
Provision for loss on accounts receivable	258	51	1,243
Provision for (benefit from) deferred income taxes	104,766	(35,063)	21,998
Excess tax benefits realized from stock-based awards	(1,324)	(5,398)	(221)
Other non-cash costs, net	32	55	47
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	32,309	(32,334)	(531)
Accounts payable and accrued expenses	(8,556)	(58)	8,400
Accrued litigation	0	(52,129)	(5,038)
Accrued compensation and benefits	983	(3,788)	12,191
Deferred revenue	14,362	8,195	1,440
Accrued income taxes, net of income tax receivable	(4,005)	18,931	(5,864)
Other current assets and prepaid expenses	8,332	(1,826)	(6,379)
Other noncurrent assets	(12,423)	(15,111)	(3,713)
Other noncurrent liabilities	863	3,953	(2,390)
Net cash provided by operating activities	217,975	78,698	156,644
Cash flows from investing activities:
Additions to property and equipment	(31,413)	(27,817)	(26,729)
Acquisitions of businesses, net of cash acquired	(220)	(280,026)	(2,721)
Net cash used by investing activities	(31,633)	(307,843)	(29,450)
Cash flows from financing activities:
Borrowings under revolving credit facility	230,000	250,000	0
Repayments of borrowings under revolving credit facility	(60,000)	(50,000)	(50,832)
Repurchases of common stock	(34,953)	(54,921)	(62,542)
Proceeds from issuance of common stock	21,210	24,756	15,284
Excess tax benefits realized from stock-based awards	1,324	5,398	221
Payments of withholding taxes in connection with vesting of stock-based awards	(20,967)	(22,520)	(20,307)
Credit facility origination costs	(1,951)	(995)	(2,559)
Other	0	(1,298)	0
Net cash provided (used) by financing activities	134,663	150,420	(120,735)
Effect of exchange rate changes on cash and cash equivalents	660	6,350	(1,328)
Net increase (decrease) in cash and cash equivalents	321,665	(72,375)	5,131
Cash and cash equivalents, beginning of year	167,878	240,253	235,122
Cash and cash equivalents, end of year	$ 489,543	$ 167,878	$ 240,253