Debt (Details) - Schedule of debt (USD $) In Millions, unless otherwise specified	May 31, 2013	May 31, 2012
Debt (Details) - Schedule of debt [Line Items]
Debt Long Term And Short Term Outstanding, Carrying Value	$ 2.0	$ 159.3
Debt Long Term And Short Term Outstanding, Fair Value	2.0	161.9
Less lines of credit and current portion of long-term debt	(2.0)	(6.5)
Less lines of credit and current portion of long-term debt	(2.0)	(6.5)
Total long-term debt		152.8
Total long-term debt		155.4
Line of Credit [Member]
Debt (Details) - Schedule of debt [Line Items]
Debt Long Term And Short Term Outstanding, Carrying Value	2.0	6.5
Debt Long Term And Short Term Outstanding, Fair Value	2.0	6.5
Notes Due 2013 [Member]
Debt (Details) - Schedule of debt [Line Items]
Debt Long Term And Short Term Outstanding, Carrying Value		152.8
Debt Long Term And Short Term Outstanding, Fair Value		$ 155.4

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Fair value of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

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- Definition

Total of the portions of the carrying amounts as of the balance sheet date of lines of credit and short-term debt and long-term debt which are scheduled to be repaid within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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- Definition

Total of the portions of the fair value of lines of credit and short-term debt and long-term debt which are scheduled to be repaid within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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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

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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)

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

+ Details

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