Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.3.1.900
Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2015
Significant Accounting Policies [Line Items]    
Minimum period warranty of product   1 year
Provision for loss contract $ 9,162 $ 9,162
Minimum [Member]    
Significant Accounting Policies [Line Items]    
Support agreements   12 months
Maximum [Member]    
Significant Accounting Policies [Line Items]    
Support agreements   36 months