Consolidated Statement of Stockholder's Equity Statement - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Cash Flow Hedging	Cash Flow Hedging Accumulated Other Comprehensive Loss	Net Investment Hedging	Net Investment Hedging Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Sep. 30, 2018		117,981,000
Beginning balance at Sep. 30, 2018	$ 874,589	$ 1,180	$ 1,558,403	$ (599,409)	$ (85,585)
Common stock issued for employee stock-based awards (in shares)		1,056,000
Common stock issued for employee stock-based awards	0	$ 11	(11)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)		(380,000)
Shares surrendered by employees to pay taxes related to stock-based awards	(33,788)	$ (4)	(33,784)
Common stock issued	(140)		(140)
Compensation expense from stock-based awards	29,407		29,407
Net income	20,985			20,985
Unrealized loss on hedging instruments	(2,678)					$ (385)	$ (385)	$ (2,293)	$ (2,293)
Foreign currency translation adjustment	(7,569)				(7,569)
Unrealized loss on available-for-sale securities, net of tax	13				13
Change in pension benefits, net of tax	711				711
Ending balance (in shares) at Dec. 29, 2018		118,657,000
Ending balance at Dec. 29, 2018	$ 1,321,169	$ 1,187	1,553,875	(138,785)	(95,108)
Beginning balance (in shares) at Sep. 30, 2019	114,899,000	114,899,000
Beginning balance at Sep. 30, 2019	$ 1,201,998	$ 1,149	1,502,949	(191,390)	(110,710)
Common stock issued for employee stock-based awards (in shares)		903,000
Common stock issued for employee stock-based awards	0	$ 9	(9)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)		(308,000)
Shares surrendered by employees to pay taxes related to stock-based awards	(22,849)	$ (3)	(22,846)
Compensation expense from stock-based awards	27,936		27,936
Net income	35,455			35,455
Unrealized loss on hedging instruments	(3,343)							$ (3,343)	$ (3,343)
Foreign currency translation adjustment	10,147				10,147
Unrealized loss on available-for-sale securities, net of tax	(7)				(7)
Change in pension benefits, net of tax	$ 52				52
Ending balance (in shares) at Dec. 28, 2019	115,494,000	115,494,000
Ending balance at Dec. 28, 2019	$ 1,247,817	$ 1,155	$ 1,508,030	$ (157,507)	$ (103,861)