Acquisitions - Narrative (Details) - Series of Individually Immaterial Business Acquisitions [Member] - USD ($) $ in Millions	12 Months Ended
Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Business Acquisition [Line Items]
Payments to Acquire Assets, Investing Activities	$ 50.3	$ 321.0	$ 281.5
Cash Distribution [Member]
Business Acquisition [Line Items]
Payments to Acquire Assets, Investing Activities	$ 11.9	$ 305.2

Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities.

No definition available.

Name:	us-gaap_PaymentsToAcquireAssetsInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration