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Income Taxes (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Nov. 30, 2019
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Income tax expense | $ 9,100,000 | $ 4,500,000 |
Effective tax rate | 13.20% | 13.00% |
Net (increase) reduction in valuation allowance |  | $ 3,300,000 |
Excess tax benefits related to stock-based compensation | $ (5,600,000) | (2,000,000.0) |
Tax credits | (4,000,000.0) | 800,000 |
Deferred tax assets | 331,400,000 |  | $ 383,700,000
Valuation allowance | 19,200,000 |  | 19,200,000
Deferred Tax Assets, Tax Credit Carryforwards | 43,322,000 | $ 0 |
Adjustments to deferred tax valuation allowance | 0 |  |
Gross unrecognized tax benefits (including interest and penalties) | $ 0 |  | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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