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Concentration of Risk and Segment Data (Segment Assets) (Details) - USD ($)
$ in Thousands
Nov. 30, 2020
Aug. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 15,269,478 $ 14,397,416
EMS    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,001,727 3,233,681
DMS    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 6,953,659 6,641,764
Other non-allocated assets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 4,314,092 $ 4,521,971