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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Apr. 30, 2026 | Jan. 31, 2026 | Apr. 30, 2025
--- | --- | --- | ---
Assets: |  |  |
Total assets measured at fair value | $ 94,990 | $ 97,309 | $ 88,345
Liabilities: |  |  |
Total liabilities measured at fair value | 55,642 | 55,749 | 50,896
Level 1 |  |  |
Assets: |  |  |
Total assets measured at fair value | 56,657 | 56,780 | 50,667
Liabilities: |  |  |
Total liabilities measured at fair value | 55,539 | 55,739 | 49,633
Level 2 |  |  |
Assets: |  |  |
Total assets measured at fair value | 65 | 484 | 1,255
Liabilities: |  |  |
Total liabilities measured at fair value | 103 | 10 | 1,263
Level 3 |  |  |
Assets: |  |  |
Total assets measured at fair value | 38,268 | 40,045 | 36,423
Liabilities: |  |  |
Total liabilities measured at fair value | 0 | 0 | 0
Other Current Assets | Available-for-sale securities |  |  |
Assets: |  |  |
Total assets measured at fair value | 286 | 281 | 265
Other Current Assets | Short-term investment |  |  |
Assets: |  |  |
Total assets measured at fair value | 153 | 153 | 151
Other Current Assets | Hedge derivatives-Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 65 | 484 | 1,255
Other Current Assets | Level 1 | Available-for-sale securities |  |  |
Assets: |  |  |
Total assets measured at fair value | 286 | 281 | 265
Other Current Assets | Level 1 | Short-term investment |  |  |
Assets: |  |  |
Total assets measured at fair value | 153 | 153 | 151
Other Current Assets | Level 1 | Hedge derivatives-Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Current Assets | Level 2 | Available-for-sale securities |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Current Assets | Level 2 | Short-term investment |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Current Assets | Level 2 | Hedge derivatives-Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 65 | 484 | 1,255
Other Current Assets | Level 3 | Available-for-sale securities |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Current Assets | Level 3 | Short-term investment |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Current Assets | Level 3 | Hedge derivatives-Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Non-current Assets | SERP assets - employer |  |  |
Assets: |  |  |
Total assets measured at fair value | 679 | 607 | 618
Other Non-current Assets | SERP assets - employee |  |  |
Assets: |  |  |
Total assets measured at fair value | 55,539 | 55,739 | 49,633
Other Non-current Assets | Level 1 | SERP assets - employer |  |  |
Assets: |  |  |
Total assets measured at fair value | 679 | 607 | 618
Other Non-current Assets | Level 1 | SERP assets - employee |  |  |
Assets: |  |  |
Total assets measured at fair value | 55,539 | 55,739 | 49,633
Other Non-current Assets | Level 2 | SERP assets - employer |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Non-current Assets | Level 2 | SERP assets - employee |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Non-current Assets | Level 3 | SERP assets - employer |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other Non-current Assets | Level 3 | SERP assets - employee |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other non-current liabilities | SERP liabilities - employee |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 55,539 | 55,739 | 49,633
Other non-current liabilities | Defined Benefit Plan Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 38,268 | 40,045 | 36,423
Other non-current liabilities | Level 1 | SERP liabilities - employee |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 55,539 | 55,739 | 49,633
Other non-current liabilities | Level 1 | Defined Benefit Plan Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other non-current liabilities | Level 2 | SERP liabilities - employee |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 0 | 0 | 0
Other non-current liabilities | Level 2 | Defined Benefit Plan Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 0 | 0 | 0
Other non-current liabilities | Level 3 | SERP liabilities - employee |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 0 | 0 | 0
Other non-current liabilities | Level 3 | Defined Benefit Plan Assets |  |  |
Assets: |  |  |
Total assets measured at fair value | 38,268 | 40,045 | 36,423
Accrued Liabilities | Hedge derivatives-Liabilities |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 103 | 10 | 1,263
Accrued Liabilities | Level 1 | Hedge derivatives-Liabilities |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 0 | 0 | 0
Accrued Liabilities | Level 2 | Hedge derivatives-Liabilities |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | 103 | 10 | 1,263
Accrued Liabilities | Level 3 | Hedge derivatives-Liabilities |  |  |
Liabilities: |  |  |
Total liabilities measured at fair value | $ 0 | $ 0 | $ 0

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