CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Income Statement [Abstract]
Revenues	$ 204,398	$ 184,059	$ 401,111	$ 376,187
Cost of revenues	87,636	77,527	174,311	161,306
Gross profit	116,762	106,532	226,800	214,881
Operating expenses:
Research and development	48,742	41,750	97,191	91,398
Selling, general and administrative	44,485	37,415	86,427	76,231
Total operating expenses	93,227	79,165	183,618	167,629
Operating income	23,535	27,367	43,182	47,252
Interest expense	(6,834)	(4,217)	(13,731)	(8,365)
Interest income and other, net	1,948	1,620	4,930	3,272
Income before income taxes	18,649	24,770	34,381	42,159
Benefit from (provision for) income taxes	31	(179)	1,013	3,379
Net income	$ 18,680	$ 24,591	$ 35,394	$ 45,538
Net income per share:
Basic (in dollars per share)	$ 0.14	$ 0.18	$ 0.27	$ 0.34
Diluted (in dollars per share)	$ 0.14	$ 0.18	$ 0.26	$ 0.33
Weighted average shares:
Basic (in shares)	133,269	134,186	133,286	134,059
Diluted (in shares)	136,059	137,206	136,434	137,698