Intangible Assets that Have Definite Lives (Detail) (USD $)	3 Months Ended	12 Months Ended
	Sep. 27, 2013	Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Carrying Value	$ 15,303,000	$ 15,176,000
Accumulated Amortization	11,999,000	11,490,000
Intangibles Net	3,304,000	3,686,000
Customer list
Finite-Lived Intangible Assets [Line Items]
Original Average Lives in Years	15 years	15 years
Amortization Method	Straight Line	Straight Line
Carrying Value	190,000	190,000
Accumulated Amortization	106,000	100,000
Intangibles Net	84,000	90,000
Trademarks
Finite-Lived Intangible Assets [Line Items]
Original Average Lives in Years	15 years	15 years
Amortization Method	Cash Flow	Cash Flow
Carrying Value	2,270,000	2,270,000
Accumulated Amortization	1,186,000	1,105,000
Intangibles Net	1,084,000	1,165,000
Technology
Finite-Lived Intangible Assets [Line Items]
Original Average Lives in Years	10 years	10 years
Amortization Method	Cash Flow	Cash Flow
Carrying Value	10,950,000	10,950,000
Accumulated Amortization	10,310,000	9,946,000
Intangibles Net	640,000	1,004,000
Distribution Rights
Finite-Lived Intangible Assets [Line Items]
Original Average Lives in Years	7 years	7 years
Amortization Method	Straight Line	Straight Line
Carrying Value	148,000	148,000
Accumulated Amortization	12,000	2,000
Intangibles Net	136,000	146,000
Patents pending
Finite-Lived Intangible Assets [Line Items]
Carrying Value	672,000	672,000
Intangibles Net	672,000	672,000
Patents
Finite-Lived Intangible Assets [Line Items]
Original Average Lives in Years	10 years	10 years
Amortization Method	Straight Line	Straight Line
Carrying Value	1,073,000	946,000
Accumulated Amortization	385,000	337,000
Intangibles Net	$ 688,000	$ 609,000