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Concentration of Risk and Segment Data (Segment Assets) (Details 4) - USD ($)
$ in Thousands
Nov. 30, 2017
Aug. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 11,519,565 $ 11,095,995
EMS [Member] | Operating Segments [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,156,266 2,778,820
DMS [Member] | Operating Segments [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 5,490,658 5,290,468
Other non-allocated assets | Operating Segments [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 2,872,641 $ 3,026,707