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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