Summary of Business and Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jul. 31, 2019
Summary Of Business And Accounting Policies [Line Items]
Period of amortization	3 years
Minimum
Summary Of Business And Accounting Policies [Line Items]
Customer payment period	30 days
Maximum
Summary Of Business And Accounting Policies [Line Items]
Customer payment period	60 days