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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014
Fair Value Measurements using Significant Unobservable Inputs
Balance, May 31, 2013, Financial Assets	$ 1,850
Balance, May 31, 2013, Financial Liabilities	75,049
Total gains or losses (realized/unrealized):
Included in earnings, Financial Assets	0
Earnings revaluation gain - Included in Earnings, Financial Liabilities	(4,994)
Earnings revaluation expense - Included in Earnings, Financial Liabilities	3,276
Included in other comprehensive income, Financial Assets	(16)
Included in other comprehensive income, Financial Liabilities	0
Purchases, issuances and settlements, Financial Assets	(25)
Purchases, issuances and settlements, Financial Liabilities	(10,880)
Transfers in and/or (out) of Level 3, Financial Assets	0
Transfers in and/or (out) of Level 3, Financial Liabilities	0
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Liability Contingent Consideration Earn Out Asset	0
Contingent liability for acquisition earn out, Financial Liabilities	4,970
Balance, May 31, 2014, Financial Assets	1,809
Balance, May 31, 2014, Financial Liabilities	$ 67,421

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