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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jan. 31, 2017
Jan. 31, 2016
Assets:    
Total assets measured at fair value $ 32,530 $ 26,353
Liabilities:    
Total liabilities measured at fair value 31,042 26,016
Other Current Assets | Available-for-sale securities    
Assets:    
Total assets measured at fair value 309 268
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 145 64
Other non-current assets | SERP assets - employer    
Assets:    
Total assets measured at fair value 1,091 1,168
Other non-current assets | SERP assets - employee    
Assets:    
Total assets measured at fair value 30,831 24,853
Other non-current liabilities | SERP liabilities - employee    
Liabilities:    
Total liabilities measured at fair value 30,831 24,853
Accrued Liabilities | Hedge derivatives-Liabilities    
Liabilities:    
Total liabilities measured at fair value 211 1,163
Level 1    
Assets:    
Total assets measured at fair value 32,385 26,289
Liabilities:    
Total liabilities measured at fair value 30,831 24,853
Level 1 | Other Current Assets | Available-for-sale securities    
Assets:    
Total assets measured at fair value 309 268
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 1,091 1,168
Level 1 | Other non-current assets | SERP assets - employee    
Assets:    
Total assets measured at fair value 30,831 24,853
Level 1 | Other non-current liabilities | SERP liabilities - employee    
Liabilities:    
Total liabilities measured at fair value 30,831 24,853
Level 2    
Assets:    
Total assets measured at fair value 145 64
Liabilities:    
Total liabilities measured at fair value 211 1,163
Level 2 | Other Current Assets | Hedge derivatives-Assets    
Assets:    
Total assets measured at fair value 145 64
Level 2 | Accrued Liabilities | Hedge derivatives-Liabilities    
Liabilities:    
Total liabilities measured at fair value $ 211 $ 1,163