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Fair Value Measurement - (Details) - USD ($)
$ in Thousands
Apr. 27, 2019
Apr. 28, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 26,344 $ 34,522
Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 3,464 8,669
U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,774 992
U.S. Government sponsored entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,482 19,949
Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 1,624 4,912
Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 35,383 29,727
Restricted cash 359 28
Derivatives - asset position 91  
Derivatives - liability position (4) (236)
Assets (Liability), net 59,108 63,082
Recurring Basis | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 3,464 8,669
Recurring Basis | U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,774 992
Recurring Basis | U.S. Government sponsored entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 10,482 19,949
Recurring Basis | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 1,624 4,912
Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 35,383 29,727
Restricted cash 359 28
Derivatives - asset position 0  
Derivatives - liability position 0 0
Assets (Liability), net 46,516 30,747
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: 10,774 992
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 91 41
Derivatives - liability position (4) (236)
Assets (Liability), net 15,657 33,335
Recurring Basis | Level 2 | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 3,464 8,669
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: 10,482 19,949
Recurring Basis | Level 2 | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 1,624 4,912
Reported Value Measurement [Member] | Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivatives - asset position   41
Acquisition-related contingency consideration (3,065) (1,000)
Estimate of Fair Value Measurement | Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivatives - asset position   0
Acquisition-related contingency consideration 0 0
Estimate of Fair Value Measurement | Recurring Basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Acquisition-related contingency consideration 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
Acquisition-related contingency consideration (3,065) (1,000)
Assets (Liability), net (3,065) (1,000)
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