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Fair Value (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 30, 2012
Fair Value Measurements Using Significant Unobservable Inputs
Balance, May 31, 2012	$ 1,850
Total gains or losses (realized/unrealized):
Included in earnings
Included in other comprehensive income
Purchases, issuances and settlements
Transfers in and/or (out) of Level 3
Contingent liability for acquisition earn out	60,499
Balance, November 30, 2012	$ 62,349

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- Definition

Fair value liabilities measured on recurring basis gain loss included in earnings.

+ References

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- Definition

Fair value liabilities measured on recurring basis gain loss included in other comprehensive income

+ References

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability contingent consideration earn out liability.

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No definition available.

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- Definition

Amount of purchases, sales, issues, and settlements in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition

This element represents [net] transfers in to and out of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

No definition available.

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- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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