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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits Excluding Accrued Interest (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Income Tax Contingency [Line Items]    
Unrecognized tax benefits beginning balance $ 939 $ 378
Additions related to prior period tax positions 246  
Additions related to current period tax positions 573 675
Decreases from prior period positions   (114)
Unrecognized tax benefits ending balance $ 1,758 $ 939