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Fair Value Measurement (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jan. 28, 2017 | Jan. 30, 2016 | Apr. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | $ 28,034 |  | $ 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: | 13,076 |  | 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: | 7,644 |  | 8,522
Municipal obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities: | 6,914 |  | 1,223
Reported Value Measurement [Member] | Recurring Basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Cash and cash equivalents | 48,377 |  | 28,328
Restricted cash | 206 |  | 198
Derivatives-currency forward contract, asset | 72 |  | 0
Derivatives - currency forward contracts, liability | (206) |  | (453)
Contingent liability | (1,920) |  | (1,955)
Assets (Liabilities), net | 74,563 |  | 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: | 13,076 |  | 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: | 400 |  |
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: | 7,644 |  | 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: | 6,914 |  | 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 | 48,377 |  | 28,328
Restricted cash | 206 |  | 198
Derivatives-currency forward contract, asset | 0 |  | 0
Derivatives - currency forward contracts, liability | 0 |  | 0
Contingent liability | 0 |  | 0
Assets (Liabilities), net | 48,983 |  | 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: | 400 |  |
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 | 72 |  | 0
Derivatives - currency forward contracts, liability | (206) |  | (453)
Contingent liability | 0 |  | 0
Assets (Liabilities), net | 27,500 |  | 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: | 13,076 |  | 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: | 7,644 |  | 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: | 6,914 |  | 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 |  | 0
Derivatives - currency forward contracts, liability | 0 |  | 0
Contingent liability | (1,920) |  | (1,955)
Assets (Liabilities), net | (1,920) |  | (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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