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Fair Value Measurement - (Details) - USD ($) $ in Thousands | May 02, 2020 | Apr. 27, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | $ 1,230 | $ 26,344
Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 1,230 | 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: |  | 10,482
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: |  | 1,624
Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 40,398 | 35,383
Restricted cash | 14 | 359
Derivatives - asset position | 261 |
Derivatives - liability position | (17) | (4)
Assets (Liability), net | 41,125 | 59,108
Recurring Basis | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 1,230 | 3,464
Recurring Basis | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: |  | 10,774
Recurring Basis | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: |  | 10,482
Recurring Basis | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: |  | 1,624
Recurring Basis | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 40,398 | 35,383
Restricted cash | 14 | 359
Derivatives - asset position | 0 |
Derivatives - liability position | 0 | 0
Assets (Liability), net | 40,412 | 46,516
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
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
Recurring Basis | Level 1 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: |  | 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 | 261 | 91
Derivatives - liability position | (17) | (4)
Assets (Liability), net | 1,474 | 15,657
Recurring Basis | Level 2 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 1,230 | 3,464
Recurring Basis | Level 2 | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: |  | 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
Recurring Basis | Level 2 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: |  | 1,624
Reported Value Measurement [Member] | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Derivatives - asset position |  | 91
Acquisition-related contingent consideration | (761) | (3,065)
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 contingent 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 contingent 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 contingent consideration | (761) | (3,065)
Assets (Liability), net | (761) | (3,065)
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
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
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

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