Employee Benefits - Defined Benefit Plan Disclosures (Details) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Gain (Loss), Percent Threshold	5.00%
Defined Benefit Plan, Benefit Obligation	$ 13,000,000	$ 15,000,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan	3,000,000	$ 1,000,000
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.68%	3.22%
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 16,000,000	$ 15,000,000
Supplemental Employee Retirement Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	3,000,000	3,000,000
Defined Benefit Plan, Benefit Obligation and Unfunded Status	(4,000,000)	$ (4,000,000)
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Annual Expected Future Benefit Payments	1,000,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Annual Expected Future Benefit Payments	$ 2,000,000