Intangibles, Net (Gross Carrying Amount And Amortization Of Intangible Assets) (Details) (USD $)	12 Months Ended
	Mar. 31, 2012		Mar. 26, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 41,090,000		$ 43,831,000
Accumulated Amortization	(22,849,000)		(23,706,000)
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	1,390,000		1,390,000
Accumulated Amortization	(1,390,000)		(1,390,000)
Weighted-Average Amortization Period	9 years
License Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	440,000		440,000
Accumulated Amortization	(440,000)		(440,000)
Weighted-Average Amortization Period	9 years
Existing Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	17,235,000		17,235,000
Accumulated Amortization	(7,318,000)		(6,321,000)
Weighted-Average Amortization Period	13 years 3 months 18 days
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,758,000	[1]	2,758,000	[1]
Accumulated Amortization	(320,000)	[1]	(320,000)	[1]
Weighted-Average Amortization Period	4 years
Gross amount excluded from weighted-average amortization period	2,400,000
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	398,000		398,000
Accumulated Amortization	(258,000)		(179,000)
Weighted-Average Amortization Period	5 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	4,682,000		4,682,000
Accumulated Amortization	(1,515,000)		(1,179,000)
Weighted-Average Amortization Period	14 years 7 months 6 days
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	14,187,000		16,928,000
Accumulated Amortization	$ (11,608,000)		$ (13,877,000)
Weighted-Average Amortization Period	3 years 3 months 18 days

[1] Trademarks also includes $2.4 million of indefinite-lived assets, which are not included in the weighted-average amortization period above.