Convertible Senior Notes, Warrants, and Hedges - Net Carrying Amount Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Convertible Debt Carrying Amount [Roll Forward]
Net carrying amount, beginning of period	$ 285,541
Net carrying amount, end of period	288,977
Convertible debt
Convertible Debt Carrying Amount [Roll Forward]
Contractual interest expense	1,600	$ 1,700
Convertible debt | 0.875% Convertible Senior Notes Due 2022
Convertible Debt Carrying Amount [Roll Forward]
Contractual interest expense	827	818
Amortization of debt issuance costs during the period	270	270
Amortization of debt discount during the period	3,166	2,998
Total	4,263	$ 4,086
Net carrying amount, beginning of period	285,541
Net carrying amount, end of period	$ 288,977