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