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Selected Financial Statement Data - Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2013
Apr. 28, 2012
Selected Financial Statement Data [Abstract]    
Compensation $ 12,940 $ 11,475
Taxes, other than income taxes 2,534 3,987
Other 8,857 7,269
Accrued expenses $ 24,331 $ 22,731