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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jul. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Assets:      
Total assets measured at fair value $ 30,807 $ 26,353 $ 28,208
Liabilities:      
Total liabilities measured at fair value 28,561 26,016 26,752
Other Current Assets | Available-for-sale securities      
Assets:      
Total assets measured at fair value 271 268 331
Other Current Assets | Short-term investment      
Assets:      
Total assets measured at fair value 154    
Other Current Assets | Hedge derivatives-Assets      
Assets:      
Total assets measured at fair value 549 64 103
Other non-current assets | SERP assets - employer      
Assets:      
Total assets measured at fair value 1,364 1,168 1,667
Other non-current assets | SERP assets - employee      
Assets:      
Total assets measured at fair value 28,469 24,853 26,107
Other non-current liabilities | SERP liabilities - employee      
Liabilities:      
Total liabilities measured at fair value 28,469 24,853 26,107
Accrued Liabilities | Hedge derivatives-Liabilities      
Liabilities:      
Total liabilities measured at fair value 92 1,163 645
Level 1      
Assets:      
Total assets measured at fair value 30,258 26,289 28,105
Liabilities:      
Total liabilities measured at fair value 28,469 24,853 26,107
Level 1 | Other Current Assets | Available-for-sale securities      
Assets:      
Total assets measured at fair value 271 268 331
Level 1 | Other Current Assets | Short-term investment      
Assets:      
Total assets measured at fair value 154    
Level 1 | Other non-current assets | SERP assets - employer      
Assets:      
Total assets measured at fair value 1,364 1,168 1,667
Level 1 | Other non-current assets | SERP assets - employee      
Assets:      
Total assets measured at fair value 28,469 24,853 26,107
Level 1 | Other non-current liabilities | SERP liabilities - employee      
Liabilities:      
Total liabilities measured at fair value 28,469 24,853 26,107
Level 2      
Assets:      
Total assets measured at fair value 549 64 103
Liabilities:      
Total liabilities measured at fair value 92 1,163 645
Level 2 | Other Current Assets | Hedge derivatives-Assets      
Assets:      
Total assets measured at fair value 549 64 103
Level 2 | Accrued Liabilities | Hedge derivatives-Liabilities      
Liabilities:      
Total liabilities measured at fair value $ 92 $ 1,163 $ 645