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Operating Leases (Details) (USD $)
12 Months Ended
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Operating Leases [Abstract]      
Lease expiration Apr. 24, 2027    
Total rent liability $ 11,700,000 $ 10,700,000  
Future minimum rentals for all non-cancelable operating leases [Abstract]      
2014 46,562,000    
2015 46,428,000    
2016 41,962,000    
2017 39,281,000    
2018 36,342,000    
2019 and beyond 108,616,000    
Future minimum rentals 319,191,000    
Future rental income from subleases [Abstract]      
2014 3,651,000    
2015 3,669,000    
2016 3,772,000    
2017 3,664,000    
2018 3,634,000    
2019 and beyond 13,614,000    
Future minimum income 32,004,000    
Rental expense and rental income for operating leases [Abstract]      
Rental expense 48,265,000 48,544,000 50,318,000
Rental income $ 4,946,000 $ 4,509,000 $ 3,369,000