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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
Jan. 31, 2019
Jan. 31, 2018
Assets:    
Total assets measured at fair value $ 39,384 $ 40,554
Liabilities:    
Total liabilities measured at fair value 55,044 38,623
Level 1    
Assets:    
Total assets measured at fair value 39,362 40,010
Liabilities:    
Total liabilities measured at fair value 38,170 38,577
Level 2    
Assets:    
Total assets measured at fair value 22 544
Liabilities:    
Total liabilities measured at fair value 156 46
Level 3    
Liabilities:    
Total liabilities measured at fair value 16,718  
Other Current Assets | Available-for-sale securities    
Assets:    
Total assets measured at fair value 177 275
Other Current Assets | Short-term investment    
Assets:    
Total assets measured at fair value 155 164
Other Current Assets | Hedge derivatives-Assets    
Assets:    
Total assets measured at fair value 22 544
Other Current Assets | Level 1 | Available-for-sale securities    
Assets:    
Total assets measured at fair value 177 275
Other Current Assets | Level 1 | Short-term investment    
Assets:    
Total assets measured at fair value 155 164
Other Current Assets | Level 2 | Hedge derivatives-Assets    
Assets:    
Total assets measured at fair value 22 544
Other non-current assets | SERP assets - employer    
Assets:    
Total assets measured at fair value 860 994
Other non-current assets | SERP assets - employee    
Assets:    
Total assets measured at fair value 38,170 38,577
Other non-current assets | Level 1 | SERP assets - employer    
Assets:    
Total assets measured at fair value 860 994
Other non-current assets | Level 1 | SERP assets - employee    
Assets:    
Total assets measured at fair value 38,170 38,577
Other non-current liabilities | SERP liabilities - employee    
Liabilities:    
Total liabilities measured at fair value 38,170 38,577
Other non-current liabilities | Contingent Purchase Price Liability    
Liabilities:    
Total liabilities measured at fair value 16,718  
Other non-current liabilities | Level 1 | SERP liabilities - employee    
Liabilities:    
Total liabilities measured at fair value 38,170 38,577
Other non-current liabilities | Level 3 | Contingent Purchase Price Liability    
Liabilities:    
Total liabilities measured at fair value 16,718  
Accrued Liabilities | Hedge derivatives-Liabilities    
Liabilities:    
Total liabilities measured at fair value 156 46
Accrued Liabilities | Level 2 | Hedge derivatives-Liabilities    
Liabilities:    
Total liabilities measured at fair value $ 156 $ 46