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Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 27, 2013
Apr. 29, 2012
Jan. 29, 2012
Schedule of Accrued Liabilities [Line Items]      
Compensation, commissions and related benefits $ 9,417 $ 7,293  
Interest 243 147  
Other accrued expenses 3,163 1,881  
Accrued expenses $ 12,823 $ 9,321 [1] $ 7,594
[1] Derived from audited financial statements.