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Warranty - Additional Information (Detail) (USD $)	Feb. 28, 2015	May 31, 2014	Feb. 28, 2014	May 31, 2013
Guarantor Obligations [Line Items]
Estimated warranty obligation	$ 5,722,000us-gaap_ProductWarrantyAccrual	$ 5,697,000us-gaap_ProductWarrantyAccrual	$ 6,121,000us-gaap_ProductWarrantyAccrual	$ 5,882,000us-gaap_ProductWarrantyAccrual
Estimated warranty obligation current	3,722,000us-gaap_ProductWarrantyAccrualClassifiedCurrent	3,697,000us-gaap_ProductWarrantyAccrualClassifiedCurrent	3,921,000us-gaap_ProductWarrantyAccrualClassifiedCurrent
Estimated warranty obligation noncurrent	2,000,000us-gaap_ProductWarrantyAccrualNoncurrent	2,000,000us-gaap_ProductWarrantyAccrualNoncurrent	2,200,000us-gaap_ProductWarrantyAccrualNoncurrent
Recreational Vehicles [Member]
Guarantor Obligations [Line Items]
Estimated warranty obligation	965,000us-gaap_ProductWarrantyAccrual / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AutomobilesMember		1,900,000us-gaap_ProductWarrantyAccrual / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AutomobilesMember
Estimated warranty obligation current			1,200,000us-gaap_ProductWarrantyAccrualClassifiedCurrent / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AutomobilesMember
Estimated warranty obligation noncurrent			$ 700,000us-gaap_ProductWarrantyAccrualNoncurrent / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AutomobilesMember

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(5))

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6397716&loc=d3e11281-110244



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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

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-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



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