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Fair Value Measurement (Details) - Recurring Basis - USD ($) $ in Thousands | Jul. 30, 2016 | Apr. 30, 2016
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Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | $ 29,778 | $ 28,328
Restricted cash | 193 | 198
Derivatives-currency forward contract, asset | 122 |
Derivatives - currency forward contracts, liability |  | (453)
Assets, net | 50,293 | 52,745
Reported Value Measurement [Member] | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 14,786 | 14,927
Reported Value Measurement [Member] | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 401 |
Reported Value Measurement [Member] | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 3,799 | 8,522
Reported Value Measurement [Member] | Municipal obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 1,214 | 1,223
Estimate of Fair Value Measurement [Member] | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 29,778 | 28,328
Restricted cash | 193 | 198
Derivatives-currency forward contract, asset | 0 |
Derivatives - currency forward contracts, liability |  | 0
Assets, net | 30,372 | 28,526
Estimate of Fair Value Measurement [Member] | 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] | 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] | 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] | 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] | 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 | 122 |
Derivatives - currency forward contracts, liability |  | (453)
Assets, net | 19,921 | 24,219
Estimate of Fair Value Measurement [Member] | Level 2 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 14,786 | 14,927
Estimate of Fair Value Measurement [Member] | 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] | Level 2 | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 3,799 | 8,522
Estimate of Fair Value Measurement [Member] | Level 2 | Municipal obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | $ 1,214 | $ 1,223

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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