Nature of Operations, Accounting Policies of Consolidated Financial Statements - Additional Information (Detail) (USD $)	3 Months Ended
	Aug. 31, 2014 Vehicle
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of idle properties held for sale	2
Allowance for credit loss of notes receivable	$ 0
Impairment of long-lived assets	$ 0
Home Sales [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Product warranty	15 months
Building and Improvements [Member] | Minimum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property, plant and equipment	10 years
Building and Improvements [Member] | Maximum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property, plant and equipment	30 years
Machinery and Equipment [Member] | Minimum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property, plant and equipment	5 years
Machinery and Equipment [Member] | Maximum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property, plant and equipment	8 years