Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 30, 2018	Dec. 31, 2017	Jun. 30, 2019	Jul. 01, 2018	Sep. 30, 2018	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Effective tax rate (as a percent)				7.10%	20.00%
Tax and Jobs Act, transition tax	$ 2.4
Statutory federal tax rate						24.50%
Deferred tax benefit from tax reform remeasurement		$ 2.6	$ 10.1
Deferred tax liability valuation allowance							$ 22.3
State tax benefit	1.0
Effective income tax rate excluding revaluation of deferred taxes (as a percent)				23.40%	25.00%
Liability for uncertain tax positions	$ 12.3			$ 12.3		$ 9.4
Period during which unrecognized tax benefits would affect the effective tax rate				12 months