Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax discrete benefits	$ 2,801	$ 25,378
Change in enacted tax rate		32,264
Tax Cuts and Jobs Act of 2017, income tax expense, accounting complete, mandatory deemed repatriation tax		6,886
Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, provisional income tax benefit		32,244
Tax Cuts and Jobs Act of 2017, income tax benefit, accounting provisional, remeasurement of deferred tax assets and liabilities		$ 20
Full-year estimated annual effective tax rate, excluding impact of discrete items		17.30%	11.60%
Federal statutory income tax rate, percent		24.50%
Unrecognized tax benefits		$ 6,119		$ 5,849
Unrecognized tax benefits that would favorably impact the effective tax rate on continuing operations		$ 3,531		$ 3,234