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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2020 | May 31, 2020 | Feb. 29, 2020 | Aug. 31, 2019 | Aug. 31, 2020 | Aug. 31, 2019 | Nov. 30, 2019
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |  |  |
Income tax expense | $ 22,900,000 |  |  | $ 23,800,000 | $ 47,800,000 | $ 37,600,000 |
Effective tax rate | 22.60% |  |  | 25.90% | 20.10% | 20.50% |
Net (increase) reduction in valuation allowance | $ 100,000 |  |  |  |  | $ (3,300,000) |
Excess tax benefits related to stock-based compensation |  |  |  |  | $ (5,600,000) | (2,900,000) |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | 1,200,000 |  |  | $ 1,400,000 | 3,200,000 | 2,600,000 |
Income Taxes Receivable, Alternative Minimum Tax, CARES Act |  | $ 39,300,000 | $ 43,300,000 |  |  |  |
Tax credits | (3,100,000) |  |  |  | (10,100,000) | (4,300,000) |
Deferred tax assets | 260,500,000 |  |  |  | 260,500,000 |  | $ 383,700,000
Valuation allowance | 19,300,000 |  |  |  | 19,300,000 |  | 19,200,000
Deferred Tax Assets, Tax Credit Carryforwards | 82,617,000 |  |  | $ 0 | 82,617,000 | $ 0 |
Adjustments to deferred tax valuation allowance |  |  |  |  | 0 |  |
Gross unrecognized tax benefits (including interest and penalties) | 0 |  |  |  | 0 |  | $ 0
Income Taxes Receivable, Current | $ 43,300,000 |  |  |  | $ 43,300,000 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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