Supplemental Guarantor Condensed Consolidating Financial Statements - Schedule of Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 30, 2013	Mar. 24, 2012
OPERATING ACTIVITIES
Net cash provided by operating activities	$ 169,528	$ 212,835
INVESTING ACTIVITIES
Acquisition of a business	(3,918)
Payment of additional acquisition consideration	(16,808)	(9,784)
Proceeds from sale of business, net of cash transferred	86,250
Purchase of property and equipment	(25,888)	(14,232)
Increase in equipment under customer usage agreements	(20,955)	(19,325)
Purchase of insurance contracts	(4,000)
Proceeds from sale of intellectual property	60,000	12,500
Purchase of cost method investments	(3,625)	(250)
Increase in other assets	(4,951)	1
Net cash provided by (used in) investing activities	66,105	(31,090)
FINANCING ACTIVITIES
Repayment of long-term debt	(32,500)
Payment of debt issuance costs	(7,019)	(5,822)
Payment of contingent consideration	(42,433)	(51,680)
Net proceeds from issuance of common stock pursuant to employee stock plans	37,623	20,389
Excess tax benefit related to equity awards	4,437	2,683
Payment of employee restricted stock minimum tax withholdings	(9,972)	(5,696)
Net cash used in financing activities	(49,864)	(40,126)
Effect of exchange rate changes on cash and cash equivalents	(1,203)	610
Net increase (decrease) in cash and cash equivalents	184,566	142,229
Cash and cash equivalents, beginning of period	560,430	712,332
Cash and cash equivalents, end of period	744,996	854,561
Parent Company [Member]
OPERATING ACTIVITIES
Net cash provided by operating activities	65,009	199,520
INVESTING ACTIVITIES
Acquisition of a business	(3,698)
Payment of additional acquisition consideration	(16,808)	(9,784)
Purchase of property and equipment	(6,397)	(7,034)
Increase in equipment under customer usage agreements	(335)
Purchase of insurance contracts	(4,000)
Purchase of cost method investments	(3,400)
Increase in other assets	(1,984)
Net cash provided by (used in) investing activities	(36,622)	(16,818)
FINANCING ACTIVITIES
Repayment of long-term debt	(32,500)
Payment of debt issuance costs	(7,019)	(5,822)
Payment of contingent consideration	(42,433)	(51,680)
Net proceeds from issuance of common stock pursuant to employee stock plans	37,623	20,389
Excess tax benefit related to equity awards	4,437	2,683
Payment of employee restricted stock minimum tax withholdings	(9,972)	(5,696)
Net cash used in financing activities	(49,864)	(40,126)
Net increase (decrease) in cash and cash equivalents	(21,477)	142,576
Cash and cash equivalents, beginning of period	210,028	644,697
Cash and cash equivalents, end of period	188,551	787,273
Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES
Net cash provided by operating activities	72,387	2,888
INVESTING ACTIVITIES
Proceeds from sale of business, net of cash transferred	84,762
Purchase of property and equipment	(14,335)	(3,533)
Increase in equipment under customer usage agreements	(13,031)	(11,797)
Proceeds from sale of intellectual property	60,000	12,500
Purchase of cost method investments	(225)	(250)
Increase in other assets	(1,520)
Net cash provided by (used in) investing activities	115,651	(3,080)
FINANCING ACTIVITIES
Effect of exchange rate changes on cash and cash equivalents	(1,782)	192
Net increase (decrease) in cash and cash equivalents	186,256
Cash and cash equivalents, beginning of period	269,416
Cash and cash equivalents, end of period	455,672
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES
Net cash provided by operating activities	32,132	10,427
INVESTING ACTIVITIES
Acquisition of a business	(220)
Proceeds from sale of business, net of cash transferred	1,488
Purchase of property and equipment	(5,156)	(3,665)
Increase in equipment under customer usage agreements	(7,589)	(7,528)
Increase in other assets	(1,447)	1
Net cash provided by (used in) investing activities	(12,924)	(11,192)
FINANCING ACTIVITIES
Effect of exchange rate changes on cash and cash equivalents	579	418
Net increase (decrease) in cash and cash equivalents	19,787	(347)
Cash and cash equivalents, beginning of period	80,986	67,635
Cash and cash equivalents, end of period	100,773	67,288
Eliminations [Member]
OPERATING ACTIVITIES
Net cash provided by operating activities
INVESTING ACTIVITIES
Acquisition of a business
Payment of additional acquisition consideration
Proceeds from sale of business, net of cash transferred
Purchase of property and equipment
Increase in equipment under customer usage agreements
Purchase of insurance contracts
Proceeds from sale of intellectual property
Purchase of cost method investments
Increase in other assets
Net cash provided by (used in) investing activities
FINANCING ACTIVITIES
Repayment of long-term debt
Payment of debt issuance costs
Payment of contingent consideration
Net proceeds from issuance of common stock pursuant to employee stock plans
Excess tax benefit related to equity awards
Payment of employee restricted stock minimum tax withholdings
Net cash used in financing activities
Effect of exchange rate changes on cash and cash equivalents
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period