Fair Value Measurement (Levels 1-3) (Details) - Measured on a Recurring Basis - USD ($) $ in Thousands	Oct. 02, 2016	Apr. 03, 2016
Quoted Prices in Active Markets for Identical Assets (Level 1)
Cash Equivalents and Short-Term Investments:
US government treasuries and agencies securities	$ 62,703	$ 32,519
Money market funds	56,363	124,504
Asset-backed securities	0	0
Corporate bonds		0
International government bonds	0	0
Corporate commercial paper	0	0
Bank deposits	0	0
Repurchase agreement	0	0
Municipal bonds	0	0
Total assets measured at fair value	119,066	157,023
Significant Other Observable Inputs (Level 2)
Cash Equivalents and Short-Term Investments:
US government treasuries and agencies securities	0	0
Money market funds	0	0
Asset-backed securities	15,028	10,515
Corporate bonds	142,057	91,388
International government bonds	4,870	2,208
Corporate commercial paper	24,941	1,992
Bank deposits	11,767	11,711
Repurchase agreement	48	114
Municipal bonds	900	900
Total assets measured at fair value	199,611	118,828
Significant Unobservable Inputs (Level 3)
Cash Equivalents and Short-Term Investments:
US government treasuries and agencies securities	0	0
Money market funds	0	0
Asset-backed securities	0	0
Corporate bonds	0	0
International government bonds	0	0
Corporate commercial paper	0	0
Bank deposits	0	0
Repurchase agreement	0	0
Municipal bonds	0	0
Total assets measured at fair value	0	0
Total
Cash Equivalents and Short-Term Investments:
US government treasuries and agencies securities	62,703	32,519
Money market funds	56,363	124,504
Asset-backed securities	15,028	10,515
Corporate bonds	142,057	91,388
International government bonds	4,870	2,208
Corporate commercial paper	24,941	1,992
Bank deposits	11,767	11,711
Repurchase agreement	48	114
Municipal bonds	900	900
Total assets measured at fair value	$ 318,677	$ 275,851