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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Jul. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2017
--- | --- | --- | ---
Assets: |  |  |
Total assets measured at fair value | $ 40,736 | $ 40,554 | $ 36,277
Liabilities: |  |  |
Total liabilities measured at fair value | 39,451 | 38,623 | 34,496
Level 1 |  |  |
Assets: |  |  |
Total assets measured at fair value | 40,575 | 40,010 | 35,875
Liabilities: |  |  |
Total liabilities measured at fair value | 38,970 | 38,577 | 34,007
Level 2 |  |  |
Assets: |  |  |
Total assets measured at fair value | 161 | 544 | 402
Liabilities: |  |  |
Total liabilities measured at fair value | 481 | 46 | 489
Other Current Assets | Available-for-sale securities |  |  |
Assets: |  |  |
Total assets measured at fair value | 187 | 275 | 313
Other Current Assets | Short-term investment |  |  |
Assets: |  |  |
Total assets measured at fair value | 156 | 164 | 161
Other Current Assets | Hedge derivatives-Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 161 | 544 | 402
Other Current Assets | Level 1 | Available-for-sale securities |  |  |
Assets: |  |  |
Total assets measured at fair value | 187 | 275 | 313
Other Current Assets | Level 1 | Short-term investment |  |  |
Assets: |  |  |
Total assets measured at fair value | 156 | 164 | 161
Other Current Assets | Level 2 | Hedge derivatives-Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 161 | 544 | 402
Other non-current assets | SERP assets - employer |  |  |
Assets: |  |  |
Total assets measured at fair value | 1,262 | 994 | 1,394
Other non-current assets | SERP assets - employee |  |  |
Assets: |  |  |
Total assets measured at fair value | 38,970 | 38,577 | 34,007
Other non-current assets | Level 1 | SERP assets - employer |  |  |
Assets: |  |  |
Total assets measured at fair value | 1,262 | 994 | 1,394
Other non-current assets | Level 1 | SERP assets - employee |  |  |
Assets: |  |  |
Total assets measured at fair value | 38,970 | 38,577 | 34,007
Other non-current liabilities | SERP liabilities - employee |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 38,970 | 38,577 | 34,007
Other non-current liabilities | Level 1 | SERP liabilities - employee |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 38,970 | 38,577 | 34,007
Accrued Liabilities | Hedge derivatives-Liabilities |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 481 | 46 | 489
Accrued Liabilities | Level 2 | Hedge derivatives-Liabilities |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | $ 481 | $ 46 | $ 489

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