Convertible Senior Notes, Warrants, and Hedges - Net Carrying Amount Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Dec. 30, 2018	Dec. 31, 2017
Convertible Debt Carrying Amount [Roll Forward]
Net carrying amount, beginning of period			$ 0
Net carrying amount, end of period	$ 310,535		310,535
Convertible debt
Convertible Debt Carrying Amount [Roll Forward]
Contractual interest expense	1,600	$ 3,300	1,600	$ 3,300
Convertible debt | 0.875% Convertible Senior Notes Due 2022
Convertible Debt Carrying Amount [Roll Forward]
Net carrying amount, beginning of period			299,551
Contractual interest expense	826	827	2,480	2,480
Amortization of debt discount	3,437	3,254	10,173	9,631
Amortization of debt issuance costs	271	270	811	811
Total	4,534	$ 4,351	13,464	$ 12,922
Net carrying amount, end of period	$ 310,535		$ 310,535