Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (414,139)	$ 53,825	$ 247,358
Other comprehensive income (loss):
Translation adjustment, net of taxes	[1],[2]	9,248	(32,609)	(18,065)
Changes in unrealized gains (losses) on available-for-sale securities, net of taxes	[1],[3]	1	0	(4)
Defined benefit pension plans, net of taxes	[1],[4]	1,420	(6,560)	996
Other comprehensive income (loss), net of tax		10,669	(39,169)	(17,073)
Comprehensive income (loss)		$ (403,470)	$ 14,656	$ 230,285

[1] Reclassification adjustments were not significant during fiscal 2020, 2019, and 2018.

[2] Tax expenses (benefits) of $2,731, $(5,161), and $0 were provided on translation adjustments during fiscal 2020, 2019, and 2018, respectively. 

[3] Tax benefits of $0, $0, and $(2) were provided on changes in unrealized losses on available-for-sale securities during fiscal 2020, 2019, and 2018, respectively.

[4] Tax expenses (benefits) of $713, $(2,371), and $202 were provided on changes in defined benefit pension plans during fiscal 2020, 2019, and 2018, respectively.