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Concentration of Risk and Segment Data - Segment Assets (Details) - USD ($)
$ in Thousands
Feb. 28, 2018
Aug. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 11,488,257 $ 11,095,995
Other non-allocated assets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 2,931,737 3,026,707
EMS | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,318,119 2,778,820
DMS | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 5,238,401 $ 5,290,468