Accounts Receivables - Additional Information (Detail) $ in Millions	12 Months Ended
	Jan. 31, 2020 USD ($) Customer	Jan. 31, 2019 USD ($) Customer
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Number of customers due | Customer	2	3
Contracts receivable | $	$ 1.9	$ 3.0
Contracts receivable, interest rate	2.50%	3.60%
Minimum
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contracts receivable repayment term	0 months
Maximum
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contracts receivable repayment term	18 months