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Interest Rate Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 28, 2013
Apr. 29, 2012
Interest Rate Derivatives    
Amount of accumulated other comprehensive income (loss) related to interest rate swap contracts maturing within the next twelve months, net of tax $ 247  
Amount of tax in accumulated other comprehensive income (loss) related to interest rate swap contracts maturing within the next twelve months 149  
Interest rate cap contracts
   
Interest Rate Derivatives    
Deferred income tax benefits   8
Change in unrealized gain (loss) on our derivatives qualifying for hedge accounting 14 68
Interest rate swap contracts
   
Interest Rate Derivatives    
Aggregate notional value 50,000  
Fair value of derivative liability 794 2,493
Deferred income tax benefits 149 506
Weighted average fixed LIBOR interest rate (as a percent) 3.995%  
Derivative income (expense) 1,699 2,540
Accumulated OCI amortization 594 1,312
Change in deferred taxes 357 789
Derivative income (expense) $ (951) $ (2,101)