Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 35,811	$ 22,123
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,477	17,026
Stock-based compensation	11,893	13,382
Excess tax benefits from stock-based awards	(28)	(150)
Other non-cash items, net	28	101
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	16,142	13,295
Accounts payable and accrued expenses	(6,215)	(9,179)
Accrued compensation and benefits	(21,743)	(23,677)
Deferred revenue	(3,534)	(2,075)
Accrued income taxes	(33,779)	(2,409)
Other current assets and prepaid expenses	1,345	7,884
Other noncurrent assets and liabilities	(5,761)	164
Net cash provided by operating activities	13,636	36,485
Cash flows from investing activities:
Additions to property and equipment	(7,393)	(7,570)
Acquisitions of businesses	(222,423)	(880)
Net cash used by investing activities	(229,816)	(8,450)
Cash flows from financing activities:
Borrowings under revolving credit facility	0	40,000
Repayments of borrowings under revolving credit facility	(1,875)	(40,000)
Repurchases of common stock	(15,792)	0
Proceeds from issuance of common stock	645	7,196
Excess tax benefits from stock-based awards	28	150
Payments of withholding taxes in connection with vesting of stock-based awards	(9,348)	(12,661)
Net cash used by financing activities	(26,342)	(5,315)
Effect of exchange rate changes on cash and cash equivalents	1,371	(3,247)
Net (decrease) increase in cash and cash equivalents	(241,151)	19,473
Cash and cash equivalents, beginning of period	489,543	167,878
Cash and cash equivalents, end of period	$ 248,392	$ 187,351