Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax discrete benefits	$ (25,378)
Tax benefit from remeasurement of deferred tax liability	32,264
Tax Cuts and Jobs Act of 2017, income tax benefit, accounting complete, remeasurement of deferred tax liabilities	32,244
Tax Cuts and Jobs Act of 2017, income tax benefit, accounting provisional, remeasurement of deferred tax assets and liabilities	20
Tax Cuts and Jobs Act of 2017, income tax expense, accounting provisional, mandatory deemed repatriation tax	$ 6,886
Full-year estimated annual effective tax rate, excluding impact of discrete items	17.30%	21.80%
Federal statutory income tax rate, percent	24.50%
Unrecognized tax benefits	$ 6,771		$ 5,849
Unrecognized tax benefits that would favorably impact the effective tax rate on continuing operations	$ 4,173		$ 3,234