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Debt (Details) - Schedule of Maturities of Long-term Debt (USD $) In Millions, unless otherwise specified | Aug. 31, 2013 | May 31, 2013 | Aug. 31, 2012
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Schedule of Maturities of Long-term Debt [Abstract] |  |  |
2014 | $ 29.2 |  |
Total debt | $ 29.2 | $ 2.0 | $ 153.4

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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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