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Deferred Compensation Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 28, 2013
Apr. 29, 2012
Apr. 24, 2011
Deferred Compensation Plans      
Liability related to the Plan $ 3,545 $ 2,796  
Expense from continuing operations for contributions related to the Plan $ 100 $ 69 $ 53