Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Cash flows from operating activities:
Net income	$ 35,676us-gaap_NetIncomeLoss	$ 83,413us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	42,205	38,273
Stock-based compensation	24,064us-gaap_ShareBasedCompensation	25,330us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based awards	(163)	(8,092)
Other non-cash items, net	(1)us-gaap_OtherNoncashExpense	626us-gaap_OtherNoncashExpense
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	22,711	16,737
Accounts payable, accrued expenses and other current liabilities	(9,976)	(3,346)
Accrued compensation and benefits	(7,222)	(34,285)
Deferred revenue	32,200	29,683
Accrued and deferred income taxes	(16,565)	5,879
Other current assets and prepaid expenses	(4,942)	(2,193)
Other noncurrent assets and liabilities	(12,363)	(5,061)
Net cash provided by operating activities	105,624	146,964
Cash flows from investing activities:
Additions to property and equipment	(14,107)	(10,342)
Purchases of investments	(1,000)us-gaap_PaymentsToAcquireInvestments	0us-gaap_PaymentsToAcquireInvestments
Acquisitions of businesses, net of cash acquired	180	(111,519)
Net cash used by investing activities	(14,927)	(121,861)
Cash flows from financing activities:
Borrowings under credit facility	35,000us-gaap_ProceedsFromLinesOfCredit	474,375us-gaap_ProceedsFromLinesOfCredit
Repayments of borrowings under credit facility	(116,250)us-gaap_RepaymentsOfLinesOfCredit	(414,375)us-gaap_RepaymentsOfLinesOfCredit
Repurchases of common stock	0	(39,965)
Proceeds from issuance of common stock	6	716
Excess tax benefits from stock-based awards	163	8,092
Credit facility origination costs	0us-gaap_PaymentsOfDebtIssuanceCosts	(4,120)us-gaap_PaymentsOfDebtIssuanceCosts
Payments of withholding taxes in connection with vesting of stock-based awards	(21,864)	(21,637)
Net cash (used) provided by financing activities	(102,945)	3,086
Effect of exchange rate changes on cash and cash equivalents	(13,591)	368
Net (decrease) increase in cash and cash equivalents	(25,839)	28,557
Cash and cash equivalents, beginning of period	293,654	241,913
Cash and cash equivalents, end of period	267,815
Supplemental disclosure of non-cash investing activities:
Fair value of contingent consideration recorded for acquisition	$ 0	$ 13,048

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

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-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 15

-Subparagraph (b)

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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