Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Dec. 30, 2017	Dec. 29, 2018	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)	$ 11,900,000
Tax Cuts and Jobs Act of 2017, income tax expense (benefit), remeasurement of certain deferred tax assets and liabilities	8,900,000
Tax Cuts and Jobs Act of 2017, income tax expense (benefit), transition tax fior accumulated foreign earnings	3,000,000
Operating loss carryforwards	100,000	$ 3,400,000
Valuation allowance	800,000	1,148,000	$ 0
Income tax penalties and interest accrued	0	0	$ 0
Unrecognized tax benefits that would impact effective tax rate		7,400,000
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 10,100,000	$ 10,700,000