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Income Taxes and Other Taxes (Details) $ in Millions	3 Months Ended	6 Months Ended
	Nov. 30, 2016 USD ($)	Nov. 30, 2016 USD ($)
Income Tax And Non Income Tax Disclosure [Abstract]
Annualized effective income tax rate (percentage)		38.90%
Effective income tax rate (percentage)	38.80%	40.30%
Wisconsin | State Sales Tax Assessment [Member]
Loss Contingencies [Line Items]
Sales payable	$ 5.4	$ 5.4

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Effective Income Tax Rate, Annualized, Percent

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: 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=65882285&loc=d3e32698-109319

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying value as of the balance sheet date of liabilities incurred through that date and payable for statutory sales and use taxes, including value added tax.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03.15(a))
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