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Concentration of Risk and Segment Data (Segment Assets) (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Aug. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 12,970,475 $ 12,045,641
EMS    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,353,465 3,456,866
DMS    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,988,198 5,378,436
Other non-allocated assets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 3,628,812 $ 3,210,339