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Accounts and Contracts Receivables - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Jan. 31, 2016
USD ($)
Customer
Jan. 31, 2015
USD ($)
Customer
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Contracts receivable | $ $ 2,877 $ 3,639
Number of customers due 3 3
Contracts receivable, interest rate 4.10% 1.90%
Number of customers entered into structured payment arrangements 4  
Long-term accounts receivable with two customers | $ $ 3,700  
Number of customers with long-term accounts receivable 2  
Long-term contracts receivable with two customers | $ $ 1,300  
Number of customers with long-term contracts receivable 2  
Minimum [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Contracts receivable repayment term 1 month 1 month
Maximum [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Contracts receivable repayment term 17 months 10 months