Accounts and Contracts Receivables - Additional Information (Detail) $ in Thousands	12 Months Ended
	Jan. 31, 2018 USD ($) Customer	Jan. 31, 2017 USD ($) Customer
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contracts receivable | $	$ 4,921	$ 2,752
Number of customers due	5	5
Contracts receivable, interest rate	2.80%	2.20%
Number of customers entered into structured payment arrangements	5
Number of customers with long-term accounts receivable	2
Long-term accounts receivable with two customers | $	$ 3,700
Number of customers with long-term contracts receivable	2
Long-term contracts receivable with two customers | $	$ 2,100
Minimum
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contracts receivable repayment term	1 month
Maximum
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contracts receivable repayment term	40 months