Acquisition (Details Textual) (USD $)	9 Months Ended
Feb. 28, 2013
Noncontrolling Interest in Joint Ventures	$ 4,000,000
Ownership Percentage In Joint Ventures	73.00%
Corporate Joint Venture [Member]
Non-Recourse Debt	$ 25,744,000

Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant