Guarantees - Additional Information (Detail) (USD $)	May 31, 2014
Residual Value Guarantee
Loss Contingencies [Line Items]
Maximum potential obligation	$ 13,019,000
Guarantee Repayment
Loss Contingencies [Line Items]
Maximum potential obligation	3,333,000
Financial Stand-By Letters Of Credit
Loss Contingencies [Line Items]
Borrowings outstanding	$ 14,332,000

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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