Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Additional Information (Detail)

v3.8.0.1
Revenue from Contracts with Customers - Additional Information (Detail)
 3 Months Ended
Apr. 30, 2018
USD ($)
Revenue From Contract With Customer [Line Items]  
Transaction price allocated to performance obligations $ 1,500,000
Performance obligation, contracts expected duration 1 year
Period of customer pays for goods or service 1 year
Period of asset incremental costs of obtaining contract with customer expect benefit costs 1 year
Impairment costs $ 0
Revenue practical expedients, incremental cost of obtaining contract amortization period of assets 1 year
Hardware and Software Maintenance [Member]  
Revenue From Contract With Customer [Line Items]  
Commissions and special incentive payments amortized period 5 years
Short-term Contract with Customer [Member]  
Revenue From Contract With Customer [Line Items]  
Capitalized incremental costs to obtain contracts $ 400,000
ASU 2014-09 [Member]  
Revenue From Contract With Customer [Line Items]  
Acquisition costs expensed over expected period 5 years