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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Feb. 28, 2018 | Aug. 31, 2019 | Aug. 31, 2018 | Nov. 30, 2018 | Nov. 30, 2017
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% |  | 21.00% | 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | $ 1.5 | $ 381.4 |  | $ 1.5 |  |  |
U.S. Tax Act, Incomplete Accounting, Transition Tax |  | 72.3 |  |  |  |  |
U.S. Tax Act, Non-cash Income Tax Expense (Benefit) | (1.5) | (10.3) | $ 297.9 |  | $ (308.2) | $ 301.5 |
U.S. Tax Act, Incomplete Accounting, Withholding Tax on Repatriation Earnings |  | 5.2 |  |  |  |  |
Effective income tax rate reconciliation, tax credit, amount | 15.5 | 20.6 |  | 44.4 | 326.0 |  |
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations | 2.4 | 2.0 |  | 2.6 | 5.5 |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 2.3 | 1.4 |  | 2.3 | 1.4 |  |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions |  | 1.0 |  |  | 1.5 |  |
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount | 2.5 |  |  | 2.1 | 0.5 |  |
U.S. Tax Act, Incomplete Accounting, Changes in Transition Tax |  |  |  |  | 4.3 |  |
U.S. Tax Act, Incomplete Accounting, Repatriation and Withholding Tax Impact |  |  |  |  | 73.2 |  |
Domestic Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Shares issued, tax benefit | $ 8.3 | $ 7.9 |  | 21.2 | $ 12.4 |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Effective income tax rate reconciliation, tax credit, amount |  |  |  | $ (16.2) |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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 increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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