Note 6 - Goodwill and Intangible Assets (Details) - Purchased Intangible Assets (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Mar. 30, 2014
Amortized intangible assets:
Carrying Amount	$ 146,002	$ 74,071
Accumulated Amortization	(50,962)	(44,961)
Impairment charge	(10,004)
Net Carrying Amount	85,036	29,110
Total	156,382	76,351
Total	(50,962)	(44,961)
Total	(12,284)
Total	93,136	31,390
In Process Research and Development [Member]
Amortized intangible assets:
In-process research and development	10,380	2,280
In-process research and development	(2,280)
In-process research and development	8,100	2,280
Technology-Based Intangible Assets [Member]
Amortized intangible assets:
Carrying Amount	118,794	63,043
Accumulated Amortization	(42,268)	(37,510)
Impairment charge	(9,134)
Net Carrying Amount	67,392	25,533
Total	(42,268)	(37,510)
Customer Relationships [Member]
Amortized intangible assets:
Carrying Amount	15,165	6,095
Accumulated Amortization	(3,600)	(2,762)
Impairment charge	(870)
Net Carrying Amount	10,695	3,333
Total	(3,600)	(2,762)
Distribution Rights [Member]
Amortized intangible assets:
Carrying Amount	7,254	1,264
Accumulated Amortization	(1,536)	(1,260)
Net Carrying Amount	5,718	4
Total	(1,536)	(1,260)
Patents [Member]
Amortized intangible assets:
Carrying Amount	3,459	3,459
Accumulated Amortization	(3,412)	(3,378)
Net Carrying Amount	47	81
Total	(3,412)	(3,378)
Trade Names [Member]
Amortized intangible assets:
Carrying Amount	1,330	210
Accumulated Amortization	(146)	(51)
Net Carrying Amount	1,184	159
Total	$ (146)	$ (51)