Debt (Details) - Schedule of debt (USD $) In Millions, unless otherwise specified	Aug. 31, 2014	May 31, 2014	Aug. 31, 2013
Debt (Details) - Schedule of debt [Line Items]
Debt Long Term And Short Term Outstanding, Carrying Value	$ 198.9	$ 135.8	$ 29.2
Less lines of credit, short-term debt and current portion of long-term debt	(13.9)	(15.8)	(29.2)
Total long-term debt	185.0	120.0	0
Revolving Credit Facility
Debt (Details) - Schedule of debt [Line Items]
Line of Credit Facility, Amount Outstanding	185.0	120.0	15.0
Line of Credit [Member]
Debt (Details) - Schedule of debt [Line Items]
Debt Long Term And Short Term Outstanding, Carrying Value	$ 13.9	$ 15.8	$ 14.2

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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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant