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Fair Value Measurement - (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 26, 2014
Apr. 27, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 25,398 $ 24,052
Certificates of deposit
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 7,734 4,677
U.S. Government securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 2,002 5,018
U.S. Government sponsored entities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 8,341 4,752
Municipal obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 7,321 9,605
Recurring Basis | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 45,054 40,628
Restricted cash 514 48
Derivatives - currency forward contracts 0 0
Assets, net 47,570 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: 2,002 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 (85) 7
Assets, net 23,311 19,041
Recurring Basis | Level 2 | Certificates of deposit
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 7,734 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: 8,341 4,752
Recurring Basis | Level 2 | Municipal obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 7,321 9,605
Recurring Basis | Total
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 45,054 40,628
Restricted cash 514 48
Derivatives - currency forward contracts (85) 7
Assets, net 70,881 64,735
Recurring Basis | Total | Certificates of deposit
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 7,734 4,677
Recurring Basis | Total | U.S. Government securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 2,002 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: 8,341 4,752
Recurring Basis | Total | Municipal obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 7,321 $ 9,605