Consolidated Statements of Stockholder's Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect Period of Adoption Adjustment	Net Investment Hedging	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative Effect Period of Adoption Adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Net Investment Hedging
Beginning balance at Sep. 30, 2019	$ 1,201,998	$ (1,572)		$ 1,149	$ 1,502,949	$ (191,390)	$ (1,572)	$ (110,710)
Beginning balance (in shares) at Sep. 30, 2019				114,899
Accounting Standards Update [Extensible List]		Accounting Standards Update 2016-02					Accounting Standards Update 2016-02
Common stock issued for employee stock-based awards				$ 10	(10)
Common stock issued for employee stock-based awards (in shares)				958
Shares surrendered by employees to pay taxes related to stock-based awards	(23,571)			$ (3)	(23,568)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)				(318)
Common stock issued for employee stock purchase plan	8,980			$ 1	8,979
Common stock issued for employee stock purchase plan (in shares)				156
Compensation expense from stock-based awards	48,420				48,420
Net income	42,611					42,611
Unrealized gain (loss) on net investment hedges, net of tax			$ (2,642)						$ (2,642)
Foreign currency translation adjustment	(412)							(412)
Unrealized loss on available-for-sale securities, net of tax	(544)							(544)
Change in pension benefits, net of tax	813							813
Ending balance at Mar. 28, 2020	1,274,081			$ 1,157	1,536,770	(150,351)		(113,495)
Ending balance (in shares) at Mar. 28, 2020				115,695
Beginning balance at Dec. 28, 2019	1,247,817			$ 1,155	1,508,030	(157,507)		(103,861)
Beginning balance (in shares) at Dec. 28, 2019				115,494
Common stock issued for employee stock-based awards				$ 1	(1)
Common stock issued for employee stock-based awards (in shares)				55
Shares surrendered by employees to pay taxes related to stock-based awards	(722)				(722)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)				(10)
Common stock issued for employee stock purchase plan	8,980			$ 1	8,979
Common stock issued for employee stock purchase plan (in shares)				156
Compensation expense from stock-based awards	20,484				20,484
Net income	7,156					7,156
Unrealized gain (loss) on net investment hedges, net of tax			701						701
Foreign currency translation adjustment	(10,559)							(10,559)
Unrealized loss on available-for-sale securities, net of tax	(537)							(537)
Change in pension benefits, net of tax	761							761
Ending balance at Mar. 28, 2020	1,274,081			$ 1,157	1,536,770	(150,351)		(113,495)
Ending balance (in shares) at Mar. 28, 2020				115,695
Beginning balance at Sep. 30, 2020	$ 1,438,248			$ 1,161	1,602,728	(62,267)		(103,374)
Beginning balance (in shares) at Sep. 30, 2020	116,125			116,125
Common stock issued for employee stock-based awards				$ 9	(9)
Common stock issued for employee stock-based awards (in shares)				862
Shares surrendered by employees to pay taxes related to stock-based awards	$ (27,241)			$ (2)	(27,239)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)				(276)
Common stock issued for employee stock purchase plan	10,484			$ 1	10,483
Common stock issued for employee stock purchase plan (in shares)				144
Compensation expense from stock-based awards	90,828				90,828
Net income	132,777					132,777
Unrealized gain (loss) on net investment hedges, net of tax			238						238
Foreign currency translation adjustment	4,124							4,124
Unrealized loss on available-for-sale securities, net of tax	(307)							(307)
Change in pension benefits, net of tax	1,382							1,382
Ending balance at Mar. 31, 2021	$ 1,650,533			$ 1,169	1,676,791	70,510		(97,937)
Ending balance (in shares) at Mar. 31, 2021	116,855			116,855
Beginning balance at Dec. 31, 2020	$ 1,494,929			$ 1,167	1,623,379	(38,752)		(90,865)
Beginning balance (in shares) at Dec. 31, 2020				116,664
Common stock issued for employee stock-based awards				$ 1	(1)
Common stock issued for employee stock-based awards (in shares)				60
Shares surrendered by employees to pay taxes related to stock-based awards	(1,810)				(1,810)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)				(13)
Common stock issued for employee stock purchase plan	10,484			$ 1	10,483
Common stock issued for employee stock purchase plan (in shares)				144
Compensation expense from stock-based awards	44,740				44,740
Net income	109,262					109,262
Unrealized gain (loss) on net investment hedges, net of tax			$ 7,017						$ 7,017
Foreign currency translation adjustment	(15,851)							(15,851)
Unrealized loss on available-for-sale securities, net of tax	0
Change in pension benefits, net of tax	1,762							1,762
Ending balance at Mar. 31, 2021	$ 1,650,533			$ 1,169	$ 1,676,791	$ 70,510		$ (97,937)
Ending balance (in shares) at Mar. 31, 2021	116,855			116,855