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Goodwill and Other Intangibles (Details) - Schedule of other intangible assets subject to amortization (Parentheticals) (USD $) In Millions, unless otherwise specified | Aug. 31, 2013 | May 31, 2013 | Aug. 31, 2012
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Customer Lists [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | $ 2.5 | $ 2.3 | $ 1.5
Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | $ 12.4 | $ 12.0 | $ 10.8

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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