Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 207,122	$ 87,502	$ 76,409
Other comprehensive income (loss):
Translation adjustment, net of taxes	[1],[2]	24,923	1,731	(45,624)
Net gain (loss) on derivative instruments, net of taxes	[1],[3]	0	(28)	601
Changes in unrealized gains (losses) on available-for-sale securities, net of taxes	[1],[4]	(3,330)	2,510	828
Defined benefit pension plans, net of taxes	[1],[5]	3,613	0	0
Other comprehensive income (loss), net of tax	[1]	25,206	4,213	(44,195)
Comprehensive income		232,328	91,715	32,214
Tax expense (benefit) provided on translation adjustments		(326)	279	(1,768)
Tax expense (benefit) provided on net gain (loss) on derivative instruments		0	(17)	349
Tax expense (benefit) provided on changes in unrealized gain (losses) on available-for-sale securities		(1,876)	$ 1,399	$ 486
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax		$ 1,747

[1] Reclassification adjustments were not significant during fiscal years 2017, 2016 and 2015.

[2] Tax expenses (benefits) of $(326), $279 and $(1,768) were provided on translation adjustments during fiscal 2017, 2016 and 2015, respectively.

[3] Tax expenses (benefits) of $0, $(17) and $349 were provided on net gain (loss) on derivative instruments during fiscal 2017, 2016 and 2015, respectively.

[4] Tax expenses (benefits) of $(1,876), $1,399 and $486 were provided on changes in unrealized gains (losses) on available-for-sale securities during fiscal 2017, 2016 and 2015, respectively.

[5] Tax expenses of $1,747 were provided on changes in defined benefit pension plans during fiscal 2017