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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