Consolidated Condensed Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Consolidated Condensed Statements of Income [Abstract]
Net sales	$ 210,214	$ 190,671	$ 362,779	$ 345,796
Cost of sales	109,647	91,223	186,837	166,850
Gross profit	100,567	99,448	175,942	178,946
Operating expenses:
Research and development	44,557	29,722	84,334	58,252
Selling, general and administrative	21,545	19,215	41,228	38,413
Acquisition related costs	14,937		14,937
Restructuring and other	1,455	(154)	1,455	(584)
Patent infringement settlements, net				695
Total operating expenses	82,494	48,783	141,954	96,776
Income from operations	18,073	50,665	33,988	82,170
Interest income	136	201	331	359
Interest expense	(2,806)		(3,468)
Other income (expense)	(11,994)	(38)	(11,493)	(55)
Income before income taxes	3,409	50,828	19,358	82,474
Provision for income taxes	2,557	17,461	8,258	28,465
Net income	$ 852	$ 33,367	$ 11,100	$ 54,009
Basic earnings per share	$ 0.01	$ 0.53	$ 0.18	$ 0.85
Diluted earnings per share	$ 0.01	$ 0.50	$ 0.17	$ 0.82
Basic weighted average common shares outstanding	62,241	63,217	62,137	63,329
Diluted weighted average common shares outstanding	65,085	66,125	64,892	66,203