Concentration of Risk and Segment Data (Segment Assets) (Details 5) - USD ($) $ in Thousands	Aug. 31, 2015	Aug. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 9,603,207	$ 8,479,746
EMS [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,865,172	2,300,262
DMS [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,241,699	3,460,769
Other non-allocated assets
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 2,496,336	2,699,046
Discontinued Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		$ 19,669