Note 6 - Goodwill and Intangible Assets (Details) - Purchased Intangible Assets - USD ($) $ in Thousands	Sep. 27, 2015	Mar. 29, 2015
Amortized intangible assets:
Carrying amount	$ 140,123	$ 147,249
Accumulated amortization	(64,247)	(57,472)
Net carrying amount	75,876	79,773
Impairment charge		(10,004)
Total	143,574	156,397
Total	(64,247)	(57,472)
Total	79,327	86,102
Total		(12,823)
Technology-Based Intangible Assets [Member]
Amortized intangible assets:
Carrying amount	113,785	120,041
Accumulated amortization	(52,543)	(47,259)
Net carrying amount	61,242	63,648
Impairment charge		(9,134)
Total	(52,543)	(47,259)
Customer Relationships [Member]
Amortized intangible assets:
Carrying amount	14,295	15,165
Accumulated amortization	(5,441)	(4,520)
Net carrying amount	8,854	9,775
Impairment charge		(870)
Total	(5,441)	(4,520)
Distribution Rights [Member]
Amortized intangible assets:
Carrying amount	7,254	7,254
Accumulated amortization	(2,402)	(1,973)
Net carrying amount	4,852	5,281
Total	(2,402)	(1,973)
Patents [Member]
Amortized intangible assets:
Carrying amount	3,459	3,459
Accumulated amortization	(3,459)	(3,446)
Net carrying amount		13
Total	(3,459)	(3,446)
Trade Names [Member]
Amortized intangible assets:
Carrying amount	1,330	1,330
Accumulated amortization	(402)	(274)
Net carrying amount	928	1,056
Total	(402)	(274)
In Process Research and Development [Member]
Amortized intangible assets:
In-process research and development	3,451	9,148
In-process research and development	$ 3,451	6,329
In-process research and development		$ (2,819)