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Concentration of Risk and Segment Data (Segment Assets) (Details) - USD ($)
$ in Thousands
Aug. 31, 2020
Aug. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 14,397,416 $ 12,970,475
EMS    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,247,897 4,353,465
DMS    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 5,627,869 4,988,198
Other non-allocated assets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 4,521,650 $ 3,628,812