Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Dec. 30, 2017	Dec. 28, 2019	Dec. 29, 2018
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	3,000,000.0
Operating loss carryforwards		$ 1,800,000	$ 3,400,000
Valuation allowance	800,000	3,826,000	1,148,000
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		$ 13,100,000	$ 10,700,000