Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017	Jun. 30, 2018
Income Tax Disclosure [Abstract]
U.S. federal corporate income tax rate	21.00%		35.00%
Effective income tax rate	20.00%	37.50%
Net deferred tax assets	$ 29.2			$ 29.2
Net deferred tax liabilities	132.7			135.5
Unrecognized tax benefits	1.2			$ 1.2
Decrease in unrecognized tax benefits	$ 0.1