Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Sep. 29, 2018
Income Tax Disclosure [Abstract]
Federal statutory income tax rate, percent			24.50%
Tax Cuts and Jobs Act of 2017, other measurement period adjustment, income tax expense	$ 4
Tax Cuts And Jobs Act Of 2017, potential future income tax expense (benefit)	1,297
Income tax discrete benefits	1,293	$ 25,378	$ 25,008
Change in enacted tax rate	(1,297)	32,264	31,647
Tax Cuts and Jobs Act of 2017, income tax expense, accounting complete, mandatory deemed repatriation tax		$ 6,886	6,639
Unrecognized tax benefits	7,010		6,158
Unrecognized tax benefits that would favorably impact the effective tax rate on continuing operations	$ 4,529		$ 3,740