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Interest Rate Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 28, 2012
Oct. 23, 2011
Interest rate cap contracts
Apr. 29, 2012
Interest rate cap contracts
Oct. 28, 2012
Interest rate swap contracts
Oct. 23, 2011
Interest rate swap contracts
Oct. 28, 2012
Interest rate swap contracts
Oct. 23, 2011
Interest rate swap contracts
Apr. 29, 2012
Interest rate swap contracts
Interest Rate Derivatives                
Aggregate notional value       $ 50,000   $ 50,000    
Fair value of derivative liability       1,708   1,708   2,493
Deferred income tax benefits     8     327   506
Change in unrealized loss on our derivatives qualifying for hedge accounting   26            
Weighted average fixed LIBOR interest rate (as a percent)       3.995%   3.995%    
Derivative income       413 929 785 1,367  
Accumulated OCI amortization       149 418 297 836  
Change in deferred taxes       88 252 178 503  
Derivative income       237 670 475 1,339  
Amount of accumulated other comprehensive income (loss) related to interest rate swap contracts and interest rate cap contracts maturing within the next twelve months, net of tax 544              
Amount of tax in accumulated other comprehensive income (loss) related to interest rate swap contracts and interest rate cap contracts maturing within the next twelve months $ 327