Consolidated Statement of Stockholder's Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Net Investment Hedging	Net Investment Hedging Accumulated Other Comprehensive Loss	Cash Flow Hedging	Cash Flow Hedging Accumulated Other Comprehensive Loss
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09	$ 125		$ 681	$ (556)
Beginning balance (in shares) at Sep. 30, 2017		115,333
Beginning balance at Sep. 30, 2017	885,436	$ 1,153	1,609,030	(650,840)	$ (73,907)
Common stock issued for employee stock-based awards	0	$ 13	(13)
Common stock issued for employee stock-based awards (in shares)		1,317
Shares surrendered by employees to pay taxes related to stock-based awards	(33,488)	$ (5)	(33,483)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)		(524)
Compensation expense from stock-based awards	18,331		18,331
Net income	13,877			13,877
Unrealized gain (loss) on hedging instruments, net of tax	(340)							$ (340)	$ (340)
Foreign currency translation adjustment	5,229				5,229
Unrealized loss on available-for-sale securities, net of tax	(179)				(179)
Change in pension benefits, net of tax	108				108
Ending balance (in shares) at Dec. 30, 2017		116,126
Ending balance at Dec. 30, 2017	889,099	$ 1,161	1,594,546	(637,519)	(69,089)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-16	72,261			72,261
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09	$ 367,378			367,378
Beginning balance (in shares) at Sep. 30, 2018	117,981	117,981
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	0	$ 11	(11)
Common stock issued for employee stock-based awards (in shares)		1,056
Shares surrendered by employees to pay taxes related to stock-based awards	(33,788)	$ (4)	(33,784)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)		(380)
Common stock issued	(140)		(140)
Compensation expense from stock-based awards	29,407		29,407
Net income	20,985			20,985
Unrealized gain (loss) on hedging instruments, net of tax	(2,678)					$ (2,293)	$ (2,293)	$ (385)	$ (385)
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	118,567	118,657
Ending balance at Dec. 29, 2018	$ 1,321,169	$ 1,187	$ 1,553,875	$ (138,785)	$ (95,108)