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Gain on Sale of Idle Property, Plant and Equipment - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Gain (Loss) on Investments [Line Items]
Gain on the sale of idle facilities	$ 162,000	$ 1,411,000	$ 162,000	$ 1,411,000
Fair Haven, Vermont [Member]
Gain (Loss) on Investments [Line Items]
Number of idle facilities sold	1
Fair Haven, Vermont [Member] | Manufactured Housing Facility [Member]
Gain (Loss) on Investments [Line Items]
Gain on the sale of idle facilities	162,000
Hemet California [Member]
Gain (Loss) on Investments [Line Items]
Gain on the sale of idle facilities		$ 1,411,000
Number of idle facilities sold		2

X

- Definition

Number of idle facilities sold.

+ References

No definition available.

+ Details

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X

- 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=31042434&loc=d3e3602-108585

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