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Fair Value Measurement (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 27, 2013
Apr. 27, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 24,636 $ 24,052
Certificates of deposit
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,677 4,677
U.S. Government securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 5,010 5,018
U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,249 4,752
Municipal obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,700 9,605
Recurring Basis | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 22,122 40,628
Restricted cash 43 48
Derivatives - currency forward contracts 0 0
Assets, net 27,175 45,694
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: 5,010 5,018
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 59 7
Assets, net 19,685 19,041
Recurring Basis | Level 2 | Certificates of deposit
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,677 4,677
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: 4,249 4,752
Recurring Basis | Level 2 | Municipal obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,700 9,605
Recurring Basis | Total
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 22,122 40,628
Restricted cash 43 48
Derivatives - currency forward contracts 59 7
Assets, net 46,860 64,735
Recurring Basis | Total | Certificates of deposit
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,677 4,677
Recurring Basis | Total | U.S. Government securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 5,010 5,018
Recurring Basis | Total | U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,249 4,752
Recurring Basis | Total | Municipal obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 10,700 $ 9,605