Taxes (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 26, 2013
Apr. 27, 2012
Apr. 29, 2011
Income Tax Expense (Benefit) [Abstract]      
Unrecongized Tax Benefits, Beginning Balance $ 11,042 $ 11,022 $ 9,086
Additons Based on Tax Positions Related to the Current Year 366 600 2,351
Reduction For Uncertain Tax Positions of Prior Years 0 2,600 0
Reductions for Tax Positions of Prior Years (271) (751) 0
Reductions Due to Settlements with Taxing Authorities (799) (1,936) (53)
Reductions Due to Statute of Limitations Expirations (254) (493) (362)
Unrecognized Tax Benefits, Ending Balance $ 10,084 $ 11,042 $ 11,022