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Unconsolidated Subsidiaries - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	May 31, 2008
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in joint venture			50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investment Unconsolidated Subsidiaries Sales Revenues	$ 0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	$ 7.8us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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X

- Definition

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
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