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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, 2020
Jan. 31, 2020
Apr. 30, 2019
Assets:      
Total assets measured at fair value $ 65,808 $ 71,158 $ 73,786
Liabilities:      
Total liabilities measured at fair value 41,764 45,264 58,661
Level 1      
Assets:      
Total assets measured at fair value 43,004 46,584 42,576
Liabilities:      
Total liabilities measured at fair value 41,735 45,264 41,268
Level 2      
Assets:      
Total assets measured at fair value 5 347 8
Liabilities:      
Total liabilities measured at fair value 29 0 509
Level 3      
Assets:      
Total assets measured at fair value 22,799 24,227 31,202
Liabilities:      
Total liabilities measured at fair value 0 0 16,884
Other Current Assets | Available-for-sale securities      
Assets:      
Total assets measured at fair value 133 184 178
Other Current Assets | Short-term investment      
Assets:      
Total assets measured at fair value 148 156 152
Other Current Assets | Hedge derivatives-Assets      
Assets:      
Total assets measured at fair value 5 347 8
Other Current Assets | Level 1 | Available-for-sale securities      
Assets:      
Total assets measured at fair value 133 184 178
Other Current Assets | Level 1 | Short-term investment      
Assets:      
Total assets measured at fair value 148 156 152
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 5 347 8
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 964 988 978
Other Non-current Assets | SERP assets - employee      
Assets:      
Total assets measured at fair value 41,759 45,256 41,268
Other Non-current Assets | Level 1 | SERP assets - employer      
Assets:      
Total assets measured at fair value 964 988 978
Other Non-current Assets | Level 1 | SERP assets - employee      
Assets:      
Total assets measured at fair value 41,759 45,256 41,268
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 41,735 45,264 41,268
Other non-current liabilities | Contingent Consideration      
Liabilities:      
Total liabilities measured at fair value   0 16,884
Other non-current liabilities | Defined Benefit Plan Assets      
Assets:      
Total assets measured at fair value 22,799 24,227 31,202
Other non-current liabilities | Level 1 | SERP liabilities - employee      
Liabilities:      
Total liabilities measured at fair value 41,735 45,264 41,268
Other non-current liabilities | Level 1 | Contingent Consideration      
Liabilities:      
Total liabilities measured at fair value   0 0
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 | Contingent Consideration      
Liabilities:      
Total liabilities measured at fair value   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 | Contingent Consideration      
Liabilities:      
Total liabilities measured at fair value   0 16,884
Other non-current liabilities | Level 3 | Defined Benefit Plan Assets      
Assets:      
Total assets measured at fair value 22,799 $ 24,227 31,202
Accrued liabilities | Hedge derivatives-Liabilities      
Liabilities:      
Total liabilities measured at fair value 29   509
Accrued liabilities | Level 1 | Hedge derivatives-Liabilities      
Liabilities:      
Total liabilities measured at fair value 0   0
Accrued liabilities | Level 2 | Hedge derivatives-Liabilities      
Liabilities:      
Total liabilities measured at fair value 29   509
Accrued liabilities | Level 3 | Hedge derivatives-Liabilities      
Liabilities:      
Total liabilities measured at fair value $ 0   $ 0