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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	$ 67,421	$ 75,049
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	12.00%
Level 3 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	67,421
Revenue Based Payment [Member] | Level 3 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	64,051
Revenue Based Payment [Member] | Level 3 [Member] | Maximum [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	10.00%
Probability of payment	100.00%
Projected fiscal year of payment	2022
Revenue Based Payment [Member] | Level 3 [Member] | Minimum [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	4.00%
Probability of payment	75.00%
Projected fiscal year of payment	2015
Milestone Based Payments [Member] | Level 3 [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	$ 3,370
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	16.00%
Projected fiscal year of payment	2015
Milestone Based Payments [Member] | Level 3 [Member] | Maximum [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Summary showing the recurring fair value measurements of the contingent consideration liability
Probability of payment	100.00%
Milestone Based Payments [Member] | Level 3 [Member] | Minimum [Member] | Contingent Consideration Earn Out Liability [Member] | Recurring [Member]
Summary showing the recurring fair value measurements of the contingent consideration liability
Probability of payment	75.00%

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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