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Credit Risk Assessment for Long-term Receivables (Details) - USD ($)
$ in Thousands
Jan. 31, 2017
Jan. 31, 2016
Accounts and Financing Receivable [Line Items]    
Term receivables, long-term $ 303,686 $ 268,657
S&P credit rating, AAA+ through BBB-    
Accounts and Financing Receivable [Line Items]    
Term receivables, long-term 143,315 195,764
S&P credit rating, BB+ and lower    
Accounts and Financing Receivable [Line Items]    
Term receivables, long-term 54,639 22,520
S&P credit rating    
Accounts and Financing Receivable [Line Items]    
Term receivables, long-term 197,954 218,284
Internal Credit Rating    
Accounts and Financing Receivable [Line Items]    
Term receivables, long-term $ 105,732 $ 50,373