Concentration of Risk and Segment Data (Segment Assets) (Details 4) - USD ($) $ in Thousands	May 31, 2016	Aug. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 9,906,074	$ 9,603,207
EMS [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	2,631,139	2,865,172
DMS [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	4,615,292	4,241,699
Other non-allocated assets
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 2,659,643	$ 2,496,336