Postretirement and Other Employee Benefits (Details 2) $ in Millions	9 Months Ended
	May 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plans	$ 6.4
Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected cash contributions to funded pension plans during the fiscal year ended August 31, 2017	6.8
Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected cash contributions to funded pension plans during the fiscal year ended August 31, 2017	$ 7.6