Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.5.0.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Income Taxes Disclosure [Line Items]        
Income tax provision (benefit) $ 14,581 $ 78 $ 14,835 $ 225
Deferred tax liability related to the foreign income 14,700   14,700  
Non-U.S. Subsidiaries [Member]        
Income Taxes Disclosure [Line Items]        
Undistributed earnings of foreign subsidiaries 5,800   5,800  
Irish Operations [Member]        
Income Taxes Disclosure [Line Items]        
Deferred tax liability related to the foreign income 14,700   14,700  
Undistributed earnings of foreign subsidiaries $ 58,600   $ 58,600