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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Feb. 28, 2018	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Income tax expense (benefit) as a percent of income before income taxes		(58.40%)	3.70%	(59.50%)	7.00%
Tax benefit recorded related to the recognition of excess tax benefits from share-based compensation				$ 2.6	$ 1.6
Tax benefit recorded related to the resolution of an uncertain tax position				$ 2.8	1.4
Tax benefit recorded related to the finalization of certain tax returns					$ 1.2
Forecast
Tax benefits expected to be realized on asset impairment charges	$ 52.8

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- Definition

Income tax expense (benefit) as a percent of income before income taxes.

+ References

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- Definition

Amount of tax benefits expected to be realized on asset impairment charges.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from finalization of prior period tax returns.

+ References

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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.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

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