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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 31, 2018
Feb. 28, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Income Tax Disclosure [Abstract]          
Effective income tax rate (as a percent) 17.00%   41.00% 21.00% 44.00%
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Provisional tax benefit $ (3,476)   $ (7,727) $ (11,848) $ (16,518)
Adjustment for Error Correction          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Provisional tax benefit $ 600 $ 1,400