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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
--- | --- | ---
Assets: |  |
Total assets measured at fair value | $ 32,530 | $ 26,353
Liabilities: |  |
Total liabilities measured at fair value | 31,042 | 26,016
Other Current Assets | Available-for-sale securities |  |
Assets: |  |
Total assets measured at fair value | 309 | 268
Other Current Assets | Short-term investment |  |
Assets: |  |
Total assets measured at fair value | 154 |
Other Current Assets | Hedge derivatives-Assets |  |
Assets: |  |
Total assets measured at fair value | 145 | 64
Other non-current assets | SERP assets - employer |  |
Assets: |  |
Total assets measured at fair value | 1,091 | 1,168
Other non-current assets | SERP assets - employee |  |
Assets: |  |
Total assets measured at fair value | 30,831 | 24,853
Other non-current liabilities | SERP liabilities - employee |  |
Liabilities: |  |
Total liabilities measured at fair value | 30,831 | 24,853
Accrued Liabilities | Hedge derivatives-Liabilities |  |
Liabilities: |  |
Total liabilities measured at fair value | 211 | 1,163
Level 1 |  |
Assets: |  |
Total assets measured at fair value | 32,385 | 26,289
Liabilities: |  |
Total liabilities measured at fair value | 30,831 | 24,853
Level 1 | Other Current Assets | Available-for-sale securities |  |
Assets: |  |
Total assets measured at fair value | 309 | 268
Level 1 | Other Current Assets | Short-term investment |  |
Assets: |  |
Total assets measured at fair value | 154 |
Level 1 | Other non-current assets | SERP assets - employer |  |
Assets: |  |
Total assets measured at fair value | 1,091 | 1,168
Level 1 | Other non-current assets | SERP assets - employee |  |
Assets: |  |
Total assets measured at fair value | 30,831 | 24,853
Level 1 | Other non-current liabilities | SERP liabilities - employee |  |
Liabilities: |  |
Total liabilities measured at fair value | 30,831 | 24,853
Level 2 |  |
Assets: |  |
Total assets measured at fair value | 145 | 64
Liabilities: |  |
Total liabilities measured at fair value | 211 | 1,163
Level 2 | Other Current Assets | Hedge derivatives-Assets |  |
Assets: |  |
Total assets measured at fair value | 145 | 64
Level 2 | Accrued Liabilities | Hedge derivatives-Liabilities |  |
Liabilities: |  |
Total liabilities measured at fair value | $ 211 | $ 1,163

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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