Contractual interest rate for funds borrowed, under the debt agreement.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

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

Debt (Details) - Schedule of debt (Parentheticals)	Aug. 31, 2013	May 31, 2013	Aug. 31, 2012
Debt (Details) - Schedule of debt (Parentheticals) [Line Items]
Short-term Debt, Percentage Bearing Variable Interest Rate	1.40%
Line of Credit [Member]
Debt (Details) - Schedule of debt (Parentheticals) [Line Items]
Lines of credit weighted average interest rate	3.60%	9.00%	4.90%
Notes Due 2013 [Member]
Debt (Details) - Schedule of debt (Parentheticals) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.00%