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Fair Value Measurement (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 01, 2014
Apr. 26, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 25,441 $ 25,398
Certificates of deposit
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,417 7,734
U.S. Government securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 1,502 2,002
U.S. Government sponsored entities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 7,140 8,341
Municipal obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 6,382 7,321
Recurring Basis | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 57,435 45,054
Restricted cash 777 514
Derivatives-currency forward contract, asset 0  
Derivatives - currency forward contracts, liability   0
Assets, net 59,714 47,570
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: 1,502 2,002
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 contract, asset 194  
Derivatives - currency forward contracts, liability   85
Assets, net 24,133 23,311
Recurring Basis | Level 2 | Certificates of deposit
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,417 7,734
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: 7,140 8,341
Recurring Basis | Level 2 | Municipal obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 6,382 7,321
Recurring Basis | Total
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 57,435 45,054
Restricted cash 777 514
Derivatives-currency forward contract, asset 194  
Derivatives - currency forward contracts, liability   85
Assets, net 83,847 70,881
Recurring Basis | Total | Certificates of deposit
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,417 7,734
Recurring Basis | Total | U.S. Government securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 1,502 2,002
Recurring Basis | Total | U.S. Government sponsored entities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 7,140 8,341
Recurring Basis | Total | Municipal obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 6,382 $ 7,321