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Income Taxes (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  |  |  | $ 0.8 |
Corporate income tax rate (as a percent) | 21.00% | 35.00% |  |  |  |
Income tax expense (benefit) as a percent of income before income taxes |  |  | 8.30% | 4.10% | 7.30% | 1.90%
Tax benefit recorded related to the recognition of excess tax benefits from share-based compensation |  |  | $ 0.2 |  | $ 0.5 | $ 2.6
Unrecognized tax benefit from favorable resolution of uncertain tax position |  |  |  | $ 2.2 |  | $ 2.8

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- Definition Amount of decrease in unrecognized tax benefits resulting from recognition of excess tax benefits from share-based compensation in income tax expense. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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