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 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Jul. 31, 2016
Income Taxes Disclosure [Line Items]          
Income tax provision (benefit) $ (420) $ (1,228) $ 14,415 $ (1,003)  
Deferred tax liability related to the foreign income         $ 14,700
Reversal of tax reserves for uncertain tax positions due to the expiration of the Irish statute of limitations 400        
Non-U.S. Subsidiaries [Member]          
Income Taxes Disclosure [Line Items]          
Undistributed earnings of foreign subsidiaries $ 4,800   $ 4,800    
Irish Operations [Member]          
Income Taxes Disclosure [Line Items]          
Deferred tax liability related to the foreign income         14,700
Undistributed earnings of foreign subsidiaries         $ 58,600