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Property, Plant and Equipment - Additional Information (Detail)	3 Months Ended				12 Months Ended
	May. 31, 2015 USD ($) Facility	May. 31, 2014 USD ($) Facility	Feb. 28, 2014 USD ($) Facility	Nov. 30, 2013 USD ($) Facility	May. 31, 2015 USD ($) Facility	May. 31, 2014 USD ($) Facility
Property, Plant and Equipment [Line Items]
Number of idle facilities sold					1	2
Gain on the sale of idle facilities | $					$ 243,000	$ 706,000
Fair Haven, Vermont [Member] | Idle Housing Facility [Member]
Property, Plant and Equipment [Line Items]
Number of idle facilities sold				1
Gain on the sale of idle facilities | $				$ 162,000
Halstead, Kansas [Member] | Idle Housing Facility [Member]
Property, Plant and Equipment [Line Items]
Number of idle facilities sold			1
Gain on the sale of idle facilities | $			$ 300,000
Elkhart Indiana [Member] | Undeveloped Land [Member]
Property, Plant and Equipment [Line Items]
Number of idle facilities sold		1
Gain on the sale of idle facilities | $		$ 244,000
Ocala, Florida [Member] | Idle Housing Facility [Member]
Property, Plant and Equipment [Line Items]
Number of idle facilities sold	1
Gain on the sale of idle facilities | $	$ 243,000

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Number of idle facilities sold.

+ References

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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