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 (shares) at Oct. 03, 2015			23,970
Beginning Balance at Oct. 03, 2015	$ 796,418		$ 238	$ 128,607	$ (9,513)	$ 677,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes (shares)			354
Common stock issued under stock plans, net of shares withheld for employee taxes	2,406		$ 4	2,402
Stock-based compensation	20,289			20,289
Net income	87,502					87,502
Other comprehensive income, net of tax	4,213	[1]			4,213
Ending Balance (shares) at Oct. 01, 2016			24,324
Ending Balance at Oct. 01, 2016	910,828		$ 242	151,298	(5,300)	764,588
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans, net of shares withheld for employee taxes (shares)			307
Common stock issued under stock plans, net of shares withheld for employee taxes	(7,606)		$ 3	(7,609)
Tax impact from employee stock options	1,628			1,628
Purchase of non-controlling Interest	(528)			(528)
Stock-based compensation	26,614			26,614
Net income	207,122					207,122
Other comprehensive income, net of tax	$ 25,206	[1]			25,206
Ending Balance (shares) at Sep. 30, 2017	24,631		24,631
Ending Balance at Sep. 30, 2017	$ 1,163,264		$ 245	171,403	19,906	971,710
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle (note 2)	13,621					13,621
Common stock issued under stock plans, net of shares withheld for employee taxes (shares)			243
Common stock issued under stock plans, net of shares withheld for employee taxes	(25,746)		$ 3	(25,749)
Repurchases of common stock (shares)			(575)
Repurchases of common stock	(100,000)		$ (6)	(99,994)
Stock-based compensation	33,040			33,040
Net income	247,358					247,358
Other comprehensive income, net of tax	$ (17,073)	[1]			(17,073)
Ending Balance (shares) at Sep. 29, 2018	24,299		24,299
Ending Balance at Sep. 29, 2018	$ 1,314,464		$ 242	$ 78,700	$ 2,833	$ 1,232,689

[1] Reclassification adjustments were not significant during fiscal 2018, 2017 and 2016.