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Fair Value Measurement (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Oct. 29, 2016 | Oct. 31, 2015 | Apr. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | $ 17,904 |  | $ 24,672
Impairment loss of intangible assets | 830 | $ 0 |
Certificates of deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | 13,804 |  | 14,927
U.S. Government securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | 401 |  |
U.S. Government sponsored entities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | 2,199 |  | 8,522
Municipal obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | 1,500 |  | 1,223
Reported Value Measurement [Member] | Recurring Basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Cash and cash equivalents | 34,045 |  | 28,328
Restricted cash | 205 |  | 198
Derivatives-currency forward contract, asset | 530 |  |
Derivatives - currency forward contracts, liability |  |  | (453)
Contingent liability | (1,862) |  | (1,955)
Assets (Liabilities), net | 50,822 |  | 50,790
Reported Value Measurement [Member] | Recurring Basis | Certificates of deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | 13,804 |  | 14,927
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: | 401 |  |
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: | 2,199 |  | 8,522
Reported Value Measurement [Member] | Recurring Basis | Municipal obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | 1,500 |  | 1,223
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 | 34,045 |  | 28,328
Restricted cash | 205 |  | 198
Derivatives-currency forward contract, asset | 0 |  |
Derivatives - currency forward contracts, liability |  |  | 0
Contingent liability | 0 |  | 0
Assets (Liabilities), net | 34,651 |  | 28,526
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: | 401 |  |
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 obligations |  |  |
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-currency forward contract, asset | 530 |  |
Derivatives - currency forward contracts, liability |  |  | (453)
Contingent liability | 0 |  | 0
Assets (Liabilities), net | 18,033 |  | 24,219
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: | 13,804 |  | 14,927
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: | 2,199 |  | 8,522
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | Municipal obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | 1,500 |  | 1,223
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-currency forward contract, asset | 0 |  |
Derivatives - currency forward contracts, liability |  |  | 0
Contingent liability | (1,862) |  | (1,955)
Assets (Liabilities), net | (1,862) |  | (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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