Condensed Consolidated Statements of Stockholder's Equity Statement - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock and Additional Paid in Capital	Treasury Stock	Accumulated Other Comprehensive Income	Accumulated Deficit	Number of Common Shares [Member]
Balance at Sep. 29, 2018			$ 6,222,988	$ (791,366)	$ 73,944	$ (4,032,722)
Common Stock, Shares, Issued at Sep. 29, 2018							103,128
Treasury Stock, Shares at Sep. 29, 2018				(35,351)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances under stock plans, shares							1,028
Issuances under stock plans, Value			3,568
Stock-based compensation expense			5,816
Repurchases of Treasury Stock, shares				(449)
Repurchases of Treasury Stock, Value				$ 11,842
Other comprehensive income (loss)		$ (3,851)			(3,851)
Cumulative effect of new accounting pronouncement (1)	[1]					28,130
Net income		37,952				37,952
Common Stock, Shares, Issued at Dec. 29, 2018							104,156
Treasury Stock, Shares at Dec. 29, 2018				(35,800)
Balance at Dec. 29, 2018		1,532,617	6,232,372	$ (803,208)	70,093	(3,966,640)
Balance at Sep. 28, 2019		1,642,573	6,267,509	$ (804,118)	42,259	(3,863,077)
Common Stock, Shares, Issued at Sep. 28, 2019							105,551
Treasury Stock, Shares at Sep. 28, 2019				(35,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances under stock plans, shares							1,290
Issuances under stock plans, Value			4,852
Stock-based compensation expense			6,906
Repurchases of Treasury Stock, shares				(553)
Repurchases of Treasury Stock, Value				$ 17,550
Other comprehensive income (loss)		4,259			4,259
Cumulative effect of new accounting pronouncement (1)						0
Net income		38,345				38,345
Common Stock, Shares, Issued at Dec. 28, 2019							106,841
Treasury Stock, Shares at Dec. 28, 2019				(36,384)
Balance at Dec. 28, 2019		$ 1,679,385	$ 6,279,267	$ (821,668)	$ 46,518	$ (3,824,732)

[1] Due to the adoption of ASU 2014-09 "Revenue from Contracts with Customers (Topic 606)" using the modified retrospective approach.