Note 6 - Goodwill and Intangible Assets (Details) - Purchased Intangible Assets - USD ($) $ in Thousands	Jun. 28, 2015	Mar. 29, 2015	Jun. 29, 2014
Amortized intangible assets:
Carrying amount	$ 140,123	$ 147,249
Accumulated amortization	(60,842)	(57,472)
Net carrying amount	79,281	79,773	$ 79,281
Impairment charge		(10,004)
Total	143,574	156,397
Total	(60,842)	(57,472)
Total	82,732	86,102
Total		(12,823)
Technology-Based Intangible Assets [Member]
Amortized intangible assets:
Carrying amount	113,785	120,041
Accumulated amortization	(49,852)	(47,259)
Net carrying amount	63,933	63,648
Impairment charge		(9,134)
Total	(49,852)	(47,259)
Customer Relationships [Member]
Amortized intangible assets:
Carrying amount	14,295	15,165
Accumulated amortization	(5,005)	(4,520)
Net carrying amount	9,290	9,775
Impairment charge		(870)
Total	(5,005)	(4,520)
Distribution Rights [Member]
Amortized intangible assets:
Carrying amount	7,254	7,254
Accumulated amortization	(2,188)	(1,973)
Net carrying amount	5,066	5,281
Total	(2,188)	(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	(338)	(274)
Net carrying amount	992	1,056
Total	(338)	(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)