CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Jan. 01, 2017	Jan. 03, 2016
Income Statement [Abstract]
Revenues	$ 176,358	$ 177,610	$ 552,545	$ 508,015
Cost of revenues	72,273	69,699	233,579	194,324
Gross profit	104,085	107,911	318,966	313,691
Operating expenses:
Research and development	38,173	38,429	129,571	107,484
Selling, general and administrative	32,737	38,851	108,968	96,221
Total operating expenses	70,910	77,280	238,539	203,705
Operating income	33,175	30,631	80,427	109,986
Interest expense	(4,217)	(2,934)	(12,582)	(2,957)
Interest income and other, net	407	926	3,679	3,783
Income from continuing operations, before income taxes	29,365	28,623	71,524	110,812
Income tax benefit	(4,072)	(3,922)	(7,451)	(2,876)
Net income (loss) from continuing operations	33,437	32,545	78,975	113,688
Discontinued operations:
Gain (loss) from divestiture before income taxes	1,385	0	1,385	0
Gain (loss) from discontinued operations before income taxes	0	0	0	(547)
Income tax expense	87	0	87	15
Net income (loss) from discontinued operations	1,298	0	1,298	(562)
Net income	$ 34,735	$ 32,545	$ 80,273	$ 113,126
Basic net income per share - continuing operations (in dollars per share)	$ 0.25	$ 0.23	$ 0.59	$ 0.78
Basic net income per share - discontinued operations (in dollars per share)	0.01	0.00	0.01	0.00
Basic net income per share (in dollars per share)	0.26	0.23	0.60	0.78
Diluted net income per share - continuing operations (in dollars per share)	0.24	0.22	0.57	0.75
Diluted net loss per share - discontinued operations (in dollars per share)	0.01	0.00	0.01	0.00
Diluted net income per share (in dollars per share)	$ 0.25	$ 0.22	$ 0.58	$ 0.75
Weighted average shares:
Basic (in shares)	133,846	140,411	133,987	145,382
Diluted (in shares)	137,167	145,705	137,581	150,614