Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings
Beginning balance (in shares) at Sep. 30, 2017		24,631
Beginning balance at Sep. 30, 2017	$ 1,163,264	$ 245	$ 171,403	$ 19,906	$ 971,710
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)		243
Common stock issued under stock plans, net of shares withheld for employee taxes	(25,746)	$ 3	(25,749)
Repurchases of common stock (in shares)		(575)
Repurchase of common stock	(100,000)	$ (6)	(99,994)
Cumulative effect of change in accounting principle	13,621				13,621
Stock-based compensation	33,040		33,040
Net income (loss)	247,358				247,358
Other comprehensive loss, net of tax	(17,073)			(17,073)
Ending balance (in shares) at Sep. 29, 2018		24,299
Ending balance at Sep. 29, 2018	1,314,464	$ 242	78,700	2,833	1,232,689
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)		287
Common stock issued under stock plans, net of shares withheld for employee taxes	(3,368)	$ 2	(3,370)
Repurchases of common stock (in shares)		(604)
Repurchase of common stock	(77,410)	$ (6)	(77,404)
Stock-based compensation	36,394		36,394
Net income (loss)	53,825				53,825
Other comprehensive loss, net of tax	$ (39,169)			(39,169)
Ending balance (in shares) at Sep. 28, 2019	23,982	23,982
Ending balance at Sep. 28, 2019	$ 1,284,736	$ 238	34,320	(36,336)	1,286,514
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)		275
Common stock issued under stock plans, net of shares withheld for employee taxes	(187)	$ 3	(190)
Stock-based compensation	46,145		46,145
Net income (loss)	(414,139)				(414,139)
Other comprehensive loss, net of tax	$ 10,669			10,669
Ending balance (in shares) at Oct. 03, 2020	24,257	24,257
Ending balance at Oct. 03, 2020	$ 927,224	$ 241	$ 80,275	$ (25,667)	$ 872,375