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Detail of Certain Asset Accounts - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended	12 Months Ended	3 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011	Mar. 31, 2012	Sep. 28, 2012 Patents	Mar. 31, 2012 Patents	Sep. 28, 2012 Patents Minimum	Sep. 28, 2012 Patents Maximum	Sep. 28, 2012 Patents pending	Mar. 31, 2012 Patents pending
Certain Asset Accounts [Line items]
Amortization expense	$ 291,000	$ 342,000	$ 583,000	$ 684,000
Remaining useful lives of patents						10 years	10 years	2 years	20 years
Patent pending costs	$ 14,917,000		$ 14,917,000		$ 15,132,000	$ 834,000	$ 764,000			$ 673,000	$ 673,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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