Fair Value Measurements (Levels 1-3) (Details) - Measured on a Recurring Basis - USD ($) $ in Thousands	Jan. 01, 2017	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	$ 79,337	$ 32,519
Money market funds	35,461	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
Total assets measured at fair value	114,798	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	11,492	10,515
Corporate bonds	147,371	91,388
International government bonds	4,828	2,208
Corporate commercial paper	22,704	1,992
Bank deposits	11,407	11,711
Repurchase agreement	441	114
Municipal bonds		900
Total assets measured at fair value	198,243	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
Total assets measured at fair value	0	0
Total
Cash Equivalents and Short-Term Investments:
US government treasuries and agencies securities	79,337	32,519
Money market funds	35,461	124,504
Asset-backed securities	11,492	10,515
Corporate bonds	147,371	91,388
International government bonds	4,828	2,208
Corporate commercial paper	22,704	1,992
Bank deposits	11,407	11,711
Repurchase agreement	441	114
Municipal bonds		900
Total assets measured at fair value	$ 313,041	$ 275,851