Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.7.0.1
Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 6 Months Ended
Jul. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]  
Minimum period warranty of product 1 year
Expected annualized cost saving $ 10
Minimum [Member]  
Significant Accounting Policies [Line Items]  
Support agreements 12 months
Maximum [Member]  
Significant Accounting Policies [Line Items]  
Support agreements 36 months