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Fair Value Measurement - (Details) - USD ($) $ in Thousands | Apr. 29, 2017 | Apr. 30, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | $ 32,713 | $ 24,672
Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 12,487 | 14,927
U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 400 |
U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 12,238 | 8,522
Municipal obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 7,588 | 1,223
Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 32,623 | 28,328
Restricted cash | 216 | 198
Derivatives - asset position | 64 |
Derivatives - liability position | (277) | (453)
Assets, net | 63,448 | 50,790
Recurring Basis | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 12,487 | 14,927
Recurring Basis | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 400 |
Recurring Basis | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 12,238 | 8,522
Recurring Basis | Municipal obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 7,588 | 1,223
Recurring Basis | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 32,623 | 28,328
Restricted cash | 216 | 198
Derivatives - asset position | 0 |
Derivatives - liability position | 0 | 0
Assets, net | 33,239 | 28,526
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: | 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 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 - asset position | 64 |
Derivatives - liability position | (277) | (453)
Assets, net | 32,100 | 24,219
Recurring Basis | Level 2 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 12,487 | 14,927
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: | 12,238 | 8,522
Recurring Basis | Level 2 | Municipal obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 7,588 | 1,223
Reported Value Measurement [Member] | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Contingent liability | (1,891) | (1,955)
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Contingent liability | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Contingent liability | 0 | 0
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 |
Derivatives - liability position | 0 | 0
Contingent liability | (1,891) | (1,955)
Assets, net | (1,891) | (1,955)
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 obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | $ 0 | $ 0

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