Activity in Level Three Warrants (Detail) (USD $)	3 Months Ended	12 Months Ended
Jun. 29, 2012	Jul. 01, 2011	Mar. 31, 2012
Class of Warrant or Right [Line Items]
Level 3 Warrants, beginning of period	$ 26,000	$ 732,000	$ 732,000
Change in fair value of warrant liability	(17,000)	(492,000)	(706,000)
Level 3 Warrants, end of period	$ 9,000		$ 26,000

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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+ Details