Weighted average interest rate of short-term debt outstanding.

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 210.5-02.19(b))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph b

-Article 5

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Debt (Details) - Schedule of debt (Parentheticals)	May 31, 2014	May 31, 2013	May 31, 2012
Debt (Details) - Schedule of debt (Parentheticals) [Line Items]
Interest rate	5.00%	5.00%	5.00%
Line of Credit [Member]
Debt (Details) - Schedule of debt (Parentheticals) [Line Items]
Weighted average interest rate	2.30%	9.00%
Revolving Credit Facility [Member]
Debt (Details) - Schedule of debt (Parentheticals) [Line Items]
Interest rate	1.30%	0.00%