Long Term Debt (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Nov. 30, 2012
Long Term Debt (Textual) [Abstract]
Senior secured term loan facility	$ 150
Senior secured revolving credit facility	50
Bank credit agreement maturity period	5 Years
Percentage of quarterly repayment of term facility Year one	5.00%
Percentage of quarterly repayment of term facility year two	5.00%
Percentage of quarterly repayment of term facility year three	15.00%
Percentage of quarterly repayment of term facility year four	25.00%
Percentage of quarterly repayment of term facility year five	50.00%
Percentage of increase in interest	2.00%
Net deferred financing costs	2.2
Notional amount of interest rate swap agreement	$ 100
Fixed interest rate payments	0.74%
Line of Credit [Member]
Debt Instrument [Line Items]
Percentage of increases leverage ratio base rate, minimum	2.00%
Percentage of increases leverage ratio base rate, maximum	2.75%
Term Loan [Member]
Debt Instrument [Line Items]
Percentage of increases leverage ratio base rate, minimum	1.00%
Percentage of increases leverage ratio base rate, maximum	1.75%
Maximum [Member]
Debt Instrument [Line Items]
Percentage of increase commitment fee	0.50%
Minimum [Member]
Debt Instrument [Line Items]
Percentage of increase commitment fee	0.30%

Debt instrument increase in interest rate in case of default.

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- Definition

Percentage of quarterly repayment of term facility year five.

+ References

No definition available.

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- Definition

Percentage of quarterly repayment of term facility year four.

+ References

No definition available.

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- Definition

Percentage of quarterly repayment of term facility year one.

+ References

No definition available.

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- Definition

Percentage of quarterly repayment of term facility year three.

+ References

No definition available.

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- Definition

Percentage of quarterly repayment of term facility year two.

+ References

No definition available.

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- Definition

Total initial amount borrowed under secured long term debt facility.

+ References

No definition available.

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- Definition

When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement 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 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))

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- Definition

When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement 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 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)(2))

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- Definition

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

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-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

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

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Topic 470

-SubTopic 10

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Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Subparagraph (d)

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-Glossary Notional Amount

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