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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Nov. 02, 2019
Apr. 27, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 3,618 $ 26,344
Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 2,717 3,464
U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities:   10,774
U.S. Government sponsored entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 745 10,482
Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 156 1,624
Reported Value Measurement [Member] | Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 29,265 35,383
Restricted cash 59 359
Derivatives - asset position 70 91
Derivatives - liability position (233) (4)
Acquisition-related contingency consideration (895) (3,065)
Assets (Liabilities), net 31,884 59,108
Reported Value Measurement [Member] | Recurring Basis | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 2,717 3,464
Reported Value Measurement [Member] | Recurring Basis | U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities:   10,774
Reported Value Measurement [Member] | Recurring Basis | U.S. Government sponsored entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 745 10,482
Reported Value Measurement [Member] | Recurring Basis | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 156 1,624
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 29,265 35,383
Restricted cash 59 359
Derivatives - asset position 0 0
Derivatives - liability position 0 0
Acquisition-related contingency consideration 0 0
Assets (Liabilities), net 29,324 46,516
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1 | 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 [Member] | 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
Estimate of Fair Value Measurement [Member] | 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
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1 | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 0 0
Estimate of Fair Value Measurement [Member] | 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 70 91
Derivatives - liability position (233) (4)
Acquisition-related contingency consideration 0 0
Assets (Liabilities), net 3,455 15,657
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 2,717 3,464
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities:   0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | U.S. Government sponsored entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 745 10,482
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: 156 1,624
Estimate of Fair Value Measurement [Member] | 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 (895) (3,065)
Assets (Liabilities), net (895) (3,065)
Estimate of Fair Value Measurement [Member] | 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 [Member] | Recurring Basis | Level 3 | U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities:   0
Estimate of Fair Value Measurement [Member] | 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 [Member] | Recurring Basis | Level 3 | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities: $ 0 $ 0