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Postretirement and Other Employee Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 158,101	$ 151,715	$ 146,698
Asset Allocation (as a percent)	100.00%	100.00%
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 7,705	$ 6,682
Asset Allocation (as a percent)	5.00%	4.00%
Global equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 20,215	$ 35,932
Asset Allocation (as a percent)	13.00%	24.00%
Corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 42,522	$ 41,088
Asset Allocation (as a percent)	27.00%	27.00%
Government bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 69,880	$ 51,597
Asset Allocation (as a percent)	44.00%	34.00%
Insurance contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 17,779	$ 16,416
Asset Allocation (as a percent)	11.00%	11.00%

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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