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Fair Value Measurement - (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2013
Apr. 28, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 24,052 $ 25,258
Certificates of deposit
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,677 7,657
U.S. Government securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 5,018 7,556
U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,752 4,505
Municipal obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 9,605 5,540
Recurring Basis | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 40,628 29,423
Restricted cash 48 1,169
Derivatives - currency forward contracts 0 0
Assets, net 45,694 38,148
Recurring Basis | Level 1 | Certificates of deposit
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 0 0
Recurring Basis | Level 1 | U.S. Government securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 5,018 7,556
Recurring Basis | Level 1 | U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 0 0
Recurring Basis | Level 1 | Municipal obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 0 0
Recurring Basis | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 0 0
Restricted cash 0 0
Derivatives - currency forward contracts 7 (95)
Assets, net 19,041 17,607
Recurring Basis | Level 2 | Certificates of deposit
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,677 7,657
Recurring Basis | Level 2 | U.S. Government securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 0 0
Recurring Basis | Level 2 | U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,752 4,505
Recurring Basis | Level 2 | Municipal obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 9,605 5,540
Recurring Basis | Total
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 40,628 29,423
Restricted cash 48 1,169
Derivatives - currency forward contracts 7 (95)
Assets, net 64,735 55,755
Recurring Basis | Total | Certificates of deposit
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,677 7,657
Recurring Basis | Total | U.S. Government securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 5,018 7,556
Recurring Basis | Total | U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,752 4,505
Recurring Basis | Total | Municipal obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 9,605 $ 5,540