Shareholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Apr. 02, 2016	Mar. 28, 2015	Apr. 02, 2016	Sep. 26, 2015
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment		$ 73,179	$ (198,387)
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		(1,651)	124
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net		91	923
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		(920)	(842)
Net change in accumulated other comprehensive income (loss)		$ 70,531	(196,498)
Stock Repurchase Program, Authorized Amount					$ 400,000
Treasury Stock, Shares, Acquired		43,350		1,476,224
Treasury Stock, Value, Acquired, Cost Method		$ 2,501		$ 82,718
Other comprehensive income before reclassifications [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment	[1]	69,969	(199,228)
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		(1,651)	124
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net		0	896
Other Comprehensive Income (loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (loss) Recognized in Net Periodic Benefit Cost, After Tax		41	34
Other comprehensive income before reclassifications [Member] | Intra-entity foreign currency transactions [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment		(32,801)	45,263
Reclassification out of Accumulated Other Comprehensive Income [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment		1,202	841
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		0	0
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net		91	27
Other Comprehensive Income (loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (loss) Recognized in Net Periodic Benefit Cost, After Tax		$ 879	$ 808

[1] Includes intra-entity foreign currency transactions that are of a long-term investment nature of $(32,801) and $45,263 for the first quarters of 2016 and 2015, respectively.