Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Contingent Consideration Liability, Fair Value Disclosure	$ 13,993
Business Combination, Contingent Consideration, Liability	(13,048)
Cash flows from operating activities:
Net income	121,439	87,303
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,299	57,432
Stock-based compensation	37,862	34,880
Excess tax benefits from stock-based awards	(9,576)	(171)
Other non-cash items, net	(151)	207
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	14,625	35,874
Accounts payable, accrued expenses and other current liabilities	(3,930)	3,373
Accrued compensation and benefits	(24,278)	(11,897)
Deferred revenue	55,339	42,951
Accrued and deferred income taxes	14,545	(40,349)
Other current assets and prepaid expenses	4,125	(21,077)
Other noncurrent assets and liabilities	(13,912)	(7,504)
Net cash provided by operating activities	253,387	181,022
Cash flows from investing activities:
Additions to property and equipment	(16,721)	(19,128)
Acquisitions of businesses, net of cash acquired	(111,519)	(220,817)
Net cash used by investing activities	(128,240)	(239,945)
Cash flows from financing activities:
Borrowings under credit facility	474,375	0
Repayments of borrowings under credit facility	(417,500)	(101,875)
Repurchases of common stock	(99,915)	(54,912)
Proceeds from issuance of common stock	801	3,412
Excess tax benefits from stock-based awards	9,576	171
Payments of Debt Issuance Costs	(4,120)	0
Payments of withholding taxes in connection with vesting of stock-based awards	(26,749)	(14,974)
Net cash provided (used) by financing activities	(63,532)	(168,178)
Effect of exchange rate changes on cash and cash equivalents	645	(5,411)
Net increase (decrease) in cash and cash equivalents	62,260	(232,512)
Cash and cash equivalents, beginning of period	241,913	489,543
Cash and cash equivalents, end of period	304,173
Fair Value, Inputs, Level 3 [Member]
Contingent Consideration Liability, Fair Value Disclosure	$ 13,993