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Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 30, 2012
Jun. 30, 2012
Estimate of Fair Value
   
Assets:    
Cash and cash equivalents - money market funds $ 57,351 $ 57,351
Short term investments - bond mutual funds 10,382 10,382
Assets, Fair Value Disclosure 67,733 67,733
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Assets:    
Cash and cash equivalents - money market funds 57,351 57,351
Short term investments - bond mutual funds 10,382 10,382
Assets, Fair Value Disclosure 67,733 67,733
Significant Other Observable Inputs (Level 2)
   
Assets:    
Cash and cash equivalents - money market funds      
Short term investments - bond mutual funds      
Assets, Fair Value Disclosure      
Significant Unobservable Inputs (Level3)
   
Assets:    
Cash and cash equivalents - money market funds      
Short term investments - bond mutual funds      
Assets, Fair Value Disclosure