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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 30, 2012
Goodwill by segment
Goodwill, Beginning Balance	$ 308,912
Adjustments to purchase price allocation	(1,741)
Acquisition of Vortex	30,019
Goodwill, Ending Balance	$ 337,190

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Purchase price allocation adjustment for allocation not yet complete at the prior year end.

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