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Business Acquisitions (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
May 31, 2017
Aug. 31, 2016
Two Acquisitions (Inala & Shemer) Completed In Fiscal Year 2016 [Member]    
Business Acquisition [Line Items]    
Amount of cash paid for business acquisitions   $ 72.3
Assets acquired   92.2
Intangible assets acquired   31.4
Liabilities assumed   19.9
Two Acquisitions (Inala & Shemer) Completed In Fiscal Year 2016 [Member] | EMS [Member]    
Business Acquisition [Line Items]    
Goodwill   $ 19.3
Hanson [Member]    
Business Acquisition [Line Items]    
Date of acquisition   Jan. 13, 2016
Amount of cash paid for business acquisitions   $ 139.2
Real property   33.3
Assets acquired   406.4
Property, plant and equipment acquired   276.8
Intangible assets and goodwill acquired   129.6
Liabilities assumed   230.0
Deferred tax liabilities assumed   $ 3.9
Lewis [Member]    
Business Acquisition [Line Items]    
Date of acquisition Mar. 01, 2017  
Amount of cash paid for business acquisitions $ 31.4  
Assets acquired 32.3  
Intangible assets acquired 14.6  
Liabilities assumed 0.9  
Transaction costs 0.8  
Lewis [Member] | DMS [Member]    
Business Acquisition [Line Items]    
Goodwill $ 8.2