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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Feb. 29, 2016
Feb. 28, 2015
Feb. 28, 2014
Jun. 02, 2012
Purchase Price Allocation        
Goodwill $ 292,527 $ 279,074 $ 278,556  
Aquilex [Member]        
Purchase Price Allocation        
Current Assets       $ 78,619
Property and Equipment       27,669
Intangible Assets       87,100
Goodwill       109,636
Other Assets       205
Total Assets Acquired       303,229
Current Liabilities       (27,527)
Net Assets Acquired       $ 275,702