Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.10.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Income tax (benefits) provisions $ (775) $ 1,154 $ (2,421) $ 1,458  
Corporate federal income tax rate     21.00%   35.00%