Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.5.0.2
Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Oct. 31, 2016
Significant Accounting Policies [Line Items]      
Minimum period warranty of product   1 year  
Expected annualized cost saving $ 15.0    
Annualized cost saving to date     $ 7.5
Minimum [Member]      
Significant Accounting Policies [Line Items]      
Support agreements   12 months  
Maximum [Member]      
Significant Accounting Policies [Line Items]      
Support agreements   36 months