Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Sep. 29, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 11,889	$ 127,534
Tax Reform Income Tax Expense (Benefit)	92,900		$ 85,900
Tax Cuts and Jobs Act of 2017, Tax on Deemed Repatriation of Foreign Earnings			61,200
Deferred Tax Liabilities, Undistributed Foreign Earnings			21,800
Other tax expense (benefit)			$ (2,900)
Tax Cuts and Jobs Act of 2017 Income Tax Expense, Increase	$ 7,000
Effective income tax rate	34.90%	439.20%
Unrecognized tax benefits	$ 1,700