Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 2,381			$ 70,961	$ 705	$ 93,121
Effective tax rate	7.40%			67.70%	0.80%	38.30%
(Reduction) provision for one-time transition tax liability	$ 200	$ (11,200)			$ (11,100)		$ 53,900
Provision (benefit) for remeasurement of deferred tax balances	(100)					$ 6,100
Unrecognized tax benefits	40,000				40,000
Unrecognized tax benefits, gross increase to current year unrecognized tax benefits	900	900	$ 700
Unrecognized tax benefits, gross decrease to prior year unrecognized tax benefits	(5,100)	$ (12,500)
Balance of accrued interest and penalties, net of tax	$ 2,100				$ 2,100