Accounts Receivables - Additional Information (Detail) $ in Thousands	12 Months Ended
	Jan. 31, 2019 USD ($) Customer	Jan. 31, 2018 USD ($) Customer
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Number of customers due | Customer	3	5
Contracts receivable	$ 3,000	$ 4,900
Long-term receivables	$ 712
Contracts receivable, interest rate	3.60%	2.80%
Minimum
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contracts receivable repayment term	2 months
Maximum
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contracts receivable repayment term	36 months