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Detail of Certain Asset Accounts - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended					9 Months Ended	12 Months Ended	3 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012	Dec. 30, 2011	Mar. 31, 2012	Dec. 28, 2012 Patents pending	Mar. 31, 2012 Patents pending	Dec. 28, 2012 Patents	Mar. 31, 2012 Patents	Dec. 28, 2012 Patents Minimum	Dec. 28, 2012 Patents Maximum
Certain Asset Accounts [Line items]
Amortization expense	$ 293,000	$ 344,000	$ 876,000	$ 1,028,000
Remaining useful lives of patents								10 years	10 years	2 years	20 years
Patent pending costs	$ 14,945,000		$ 14,945,000		$ 15,132,000	$ 676,000	$ 673,000	$ 859,000	$ 764,000

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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