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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 20, 2015
Nov. 30, 2015
Nov. 30, 2014
Business Acquisition [Line Items]      
Acquisition related expenses   $ 0.0 $ 0.6
SPF Water Engineering, LLC [Member]      
Business Acquisition [Line Items]      
Acquisition date   Jul. 20, 2015  
Total cash consideration $ 2.5    
Total cash consideration, net of cash acquired 2.4    
Cash acquired from acquisition $ 0.1