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Fair Value Measurement - (Details) - USD ($)
$ in Thousands
Apr. 28, 2018
Apr. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 34,522 $ 32,713
Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 8,669 12,487
U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 992 400
U.S. Government sponsored entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 19,949 12,238
Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,912 7,588
Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 29,727 32,623
Restricted cash 28 216
Derivatives - asset position 41  
Derivatives - liability position (236) (277)
Assets (Liability), net 63,082 63,448
Recurring Basis | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 8,669 12,487
Recurring Basis | U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 992 400
Recurring Basis | U.S. Government sponsored entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 19,949 12,238
Recurring Basis | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,912 7,588
Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 29,727 32,623
Restricted cash 28 216
Derivatives - asset position 0  
Derivatives - liability position 0 0
Assets (Liability), net 30,747 33,239
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: 992 400
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 bonds    
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 - asset position 41 64
Derivatives - liability position (236) (277)
Assets (Liability), net 33,335 32,100
Recurring Basis | Level 2 | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 8,669 12,487
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: 19,949 12,238
Recurring Basis | Level 2 | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 4,912 7,588
Reported Value Measurement [Member] | Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivatives - asset position   64
Contingent liability (1,000) (1,891)
Estimate of Fair Value Measurement | Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivatives - asset position   0
Contingent liability 0 0
Estimate of Fair Value Measurement | Recurring Basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Contingent liability 0 0
Estimate of Fair Value Measurement | Recurring Basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 0 0
Restricted cash 0 0
Derivatives - asset position 0 0
Derivatives - liability position 0 0
Contingent liability   (1,891)
Assets (Liability), net (1,000) (1,891)
Estimate of Fair Value Measurement | Recurring Basis | Level 3 | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 0 0
Estimate of Fair Value Measurement | Recurring Basis | Level 3 | U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 0 0
Estimate of Fair Value Measurement | Recurring Basis | Level 3 | U.S. Government sponsored entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 0 0
Estimate of Fair Value Measurement | Recurring Basis | Level 3 | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 0 $ 0