Note 6 - Goodwill and Intangible Assets (Details) - Purchased Intangible Assets (USD $) In Thousands, unless otherwise specified	Dec. 28, 2014	Mar. 30, 2014
Amortized intangible assets:
Carrying Amount	$ 147,234	$ 74,071
Accumulated Amortization	(54,210)	(44,961)
Impairment charge	(10,004)
Net Carrying Amount	83,020us-gaap_FiniteLivedIntangibleAssetsNet	29,110us-gaap_FiniteLivedIntangibleAssetsNet
Total	156,382	76,351
Total	(54,210)	(44,961)
Total	(12,284)
Total	89,888	31,390
In Process Research and Development [Member]
Amortized intangible assets:
In-process research and development	9,148	2,280
In-process research and development	(2,280)
In-process research and development	6,868	2,280
Technology-Based Intangible Assets [Member]
Amortized intangible assets:
Carrying Amount	120,026	63,043
Accumulated Amortization	(44,745)	(37,510)
Impairment charge	(9,134)
Net Carrying Amount	66,147	25,533
Total	(44,745)	(37,510)
Customer Relationships [Member]
Amortized intangible assets:
Carrying Amount	15,165	6,095
Accumulated Amortization	(4,067)	(2,762)
Impairment charge	(870)
Net Carrying Amount	10,228	3,333
Total	(4,067)	(2,762)
Distribution Rights [Member]
Amortized intangible assets:
Carrying Amount	7,254	1,264
Accumulated Amortization	(1,759)	(1,260)
Net Carrying Amount	5,495	4
Total	(1,759)	(1,260)
Patents [Member]
Amortized intangible assets:
Carrying Amount	3,459	3,459
Accumulated Amortization	(3,429)	(3,378)
Net Carrying Amount	30	81
Total	(3,429)	(3,378)
Trade Names [Member]
Amortized intangible assets:
Carrying Amount	1,330	210
Accumulated Amortization	(210)	(51)
Net Carrying Amount	1,120	159
Total	$ (210)	$ (51)

Amount of accumulated impairment loss for an finite-lived intangible assets.

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Amount of accumulated impairment loss for indefinite-lived intangible assets.

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Amount of accumulated impairment loss for intangible assets.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit before impairment charges.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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