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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2017 | Aug. 31, 2016 | May 31, 2016 | Aug. 31, 2017 | Aug. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate (as a percent) |  |  |  | 44.00% | 36.00%
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Out of period tax benefit | $ (7,727) | $ (4,742) |  | $ (16,518) | $ (10,114)
Adjustment for Error Correction [Member] |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Out of period tax benefit |  |  | $ 2,700 |  |

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