Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total		Common Stock	Add. Paid-in Capital	Accum. Other Comp. Income (Loss)	Retained Earnings
Beginning balance at Sep. 29, 2018		$ 1,314,464		$ 242	$ 78,700	$ 2,833	$ 1,232,689
Beginning balance (in shares) at Sep. 29, 2018				24,299,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes		(9,139)		$ 2	(9,141)
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)				223,000
Repurchase of common stock		(25,501)		$ (2)	(25,499)
Repurchase of common stock (in shares)				(195,000)
Stock-based compensation		7,791			7,791
Net income		35,550					35,550
Other comprehensive income (loss), net of tax		(5,682)				(5,682)
Ending balance at Dec. 29, 2018		1,317,483		$ 242	51,851	(2,849)	1,268,239
Ending balance (in shares) at Dec. 29, 2018				24,327,000
Beginning balance at Sep. 29, 2018		1,314,464		$ 242	78,700	2,833	1,232,689
Beginning balance (in shares) at Sep. 29, 2018				24,299,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		53,201
Other comprehensive income (loss), net of tax	[1]	(12,225)
Ending balance at Jun. 29, 2019		1,301,211		$ 238	24,475	(9,392)	1,285,890
Ending balance (in shares) at Jun. 29, 2019				23,982,000
Beginning balance at Dec. 29, 2018		1,317,483		$ 242	51,851	(2,849)	1,268,239
Beginning balance (in shares) at Dec. 29, 2018				24,327,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes		(298)			(298)
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)				10,000
Repurchase of common stock		(25,905)		$ (2)	(25,903)
Repurchase of common stock (in shares)				(200,000)
Stock-based compensation		9,086			9,086
Net income		20,750					20,750
Other comprehensive income (loss), net of tax		(8,334)				(8,334)
Ending balance at Mar. 30, 2019		1,312,782		$ 240	34,736	(11,183)	1,288,989
Ending balance (in shares) at Mar. 30, 2019				24,137,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes		6,081			6,081
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)				54,000
Repurchase of common stock		(26,004)		$ (2)	(26,002)
Repurchase of common stock (in shares)				(209,000)
Stock-based compensation		9,660			9,660
Net income		(3,099)					(3,099)
Other comprehensive income (loss), net of tax		1,791	[1]			1,791
Ending balance at Jun. 29, 2019		1,301,211		$ 238	24,475	(9,392)	1,285,890
Ending balance (in shares) at Jun. 29, 2019				23,982,000
Beginning balance at Sep. 28, 2019		$ 1,284,736		$ 238	34,320	(36,336)	1,286,514
Beginning balance (in shares) at Sep. 28, 2019		23,982,000		23,982,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes		$ (7,428)		$ 2	(7,430)
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)				171,000
Stock-based compensation		7,574			7,574
Net income		5,793					5,793
Other comprehensive income (loss), net of tax		15,300				15,300
Ending balance at Dec. 28, 2019		1,305,975		$ 240	34,464	(21,036)	1,292,307
Ending balance (in shares) at Dec. 28, 2019				24,153,000
Beginning balance at Sep. 28, 2019		$ 1,284,736		$ 238	34,320	(36,336)	1,286,514
Beginning balance (in shares) at Sep. 28, 2019		23,982,000		23,982,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ (421,828)
Other comprehensive income (loss), net of tax	[1]	(1,226)
Ending balance at Jul. 04, 2020		$ 893,506		$ 241	66,141	(37,562)	864,686
Ending balance (in shares) at Jul. 04, 2020		24,256,000		24,256,000
Beginning balance at Dec. 28, 2019		$ 1,305,975		$ 240	34,464	(21,036)	1,292,307
Beginning balance (in shares) at Dec. 28, 2019				24,153,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes		950			950
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)				39,000
Stock-based compensation		9,207			9,207
Net income		(418,913)					(418,913)
Other comprehensive income (loss), net of tax		(23,789)				(23,789)
Ending balance at Apr. 04, 2020		873,430		$ 240	44,621	(44,825)	873,394
Ending balance (in shares) at Apr. 04, 2020				24,192,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes		6,320		$ 1	6,319
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)				64,000
Stock-based compensation		15,201			15,201
Net income		(8,708)					(8,708)
Other comprehensive income (loss), net of tax		7,263	[1]			7,263
Ending balance at Jul. 04, 2020		$ 893,506		$ 241	$ 66,141	$ (37,562)	$ 864,686
Ending balance (in shares) at Jul. 04, 2020		24,256,000		24,256,000

[1] Reclassification adjustments were not significant during the three and nine months ended July 4, 2020 and June 29, 2019.