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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | May 31, 2019 | Nov. 30, 2018 | Feb. 28, 2018 | Nov. 30, 2022 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2018 | Nov. 30, 2018 | Aug. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate (in percent) |  |  |  |  |  | 18.60% | 22.80% |  | 53.70% |  |
Income tax credits and adjustments |  |  |  |  |  | $ 18,700,000 | $ 4,300,000 | $ 10,700,000 |  |  |
Tax benefits from share-based compensation |  |  |  |  |  | 12,000,000.0 | 5,300,000 | 1,000,000.0 |  |  |
Nondeductible expense |  |  |  |  |  | 5,700,000 | 5,300,000 | 2,500,000 |  |  |
Net Increase (decrease) in valuation allowance recorded against net deferred tax assets |  |  |  |  |  |  | (4,400,000) | 3,300,000 |  |  |
Valuation allowance for deferred tax assets |  |  |  |  |  | (1,200,000) | (4,400,000) | (2,000,000) |  |  |
TCJA adjustment |  |  | $ 1,300,000 | $ 111,200,000 |  | $ 0 | $ 0 | 112,458,000 |  |  |
Income tax benefit computed at statutory rate (percent) |  |  |  |  |  | 21.00% | 21.00% |  | 22.20% | 22.00% |
Income tax receivable due to AMT tax credit | $ 43,300,000 | $ 39,300,000 |  |  |  | $ 82,600,000 |  |  |  |  |
AMT credit refund |  |  |  |  |  |  |  |  |  |  | $ 43,300,000
Reduction rate of refundable AMT credit carryforwards |  |  |  |  |  | 0.00% | (0.20%) |  | 0.20% |  |
AMT credit carryforwards |  |  |  |  |  | $ 75,108,000 | $ 180,737,000 |  |  |  |
Deferred tax assets |  |  |  |  |  | 249,100,000 | 383,700,000 |  |  |  |
Valuation allowance |  |  |  |  |  | 18,000,000.0 | 19,200,000 |  |  |  |
Impact of Tax Return, re-measurement of deferred tax assets |  |  |  |  |  | $ 1,200,000 |  |  |  |  |
Period for carry forward of tax benefits related to deferred tax assets |  |  |  |  |  | 20 years |  |  |  |  |
Expired state and local loss carryforwards |  |  |  |  |  | $ 400,000 |  | 1,200,000 |  |  |
Tax credit carryforwards |  |  |  |  |  | 70,800,000 |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | $ 0 |  |  | 0 | 0 | 0 | $ 0 | $ 0 |
Amount of unrecorded benefit from significant change in unrecognized tax benefits is reasonably possible |  |  |  |  |  | 0 | 0 |  |  |  |
Total accrued interest and penalties related to unrecognized income tax benefits |  |  |  |  |  | 0 | 0 |  |  |  |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) |  |  |  |  |  |  |  | 106,700,000 |  |  |
Tax Credit Carryforward, Expiring in 2038 |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Future income from continuing operations before income taxes |  |  |  |  |  | 900,000,000 |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction rate of refundable AMT credit carryforwards |  |  |  |  | 6.60% |  |  |  |  |  |
AMT credit carryforwards |  |  |  |  | $ 50,000,000.0 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deduction for certain executive compensation |  |  |  |  |  | 1,000,000 |  |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Increase (decrease) in valuation allowance recorded against net deferred tax assets |  |  |  |  |  |  |  | (3,300,000) |  |  |
Valuation allowance for deferred tax assets |  |  |  |  |  |  | $ 1,900,000 | $ (2,100,000) |  |  |
Operating loss carryforwards |  |  |  |  |  | $ 80,000,000.0 |  |  |  |  |

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