Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2018	Dec. 30, 2017	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Tax Cuts and Jobs Act of 2017 [Line Items]
Tax Reform Income Tax Expense		$ 124,500
Transition Tax for Accumulated Foreign Earnings		101,800
Deferred Tax Liabilities, Undistributed Foreign Earnings		$ 22,700
Liabilities due to U.S. Tax Reform	$ 121,800			$ 121,800
Income tax expense	$ 2,427		$ 3,124	$ 129,961	$ 5,971
Effective income tax rate	16.50%		9.60%	297.00%	9.40%
One-time Employee Bonus Impact on Effective Income Tax Rate	$ 13,500
Long-term accrued income taxes payable
Tax Cuts and Jobs Act of 2017 [Line Items]
Tax Reform Income Tax Expense	91,900
Deferred income tax liabilities
Tax Cuts and Jobs Act of 2017 [Line Items]
Tax Reform Income Tax Expense	20,000
Other accrued liabilities
Tax Cuts and Jobs Act of 2017 [Line Items]
Tax Reform Income Tax Expense	$ 9,900