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Equities - Narrative (Details)		3 Months Ended	12 Months Ended
	Mar. 30, 2017 USD ($) $ / shares shares	Aug. 31, 2018 USD ($)	Aug. 31, 2019 USD ($) pools	Aug. 31, 2018 USD ($)	Aug. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)
Class of Stock [Line Items]
Estimated patronage refunds			$ (90,000,000)	$ (75,000,000)
Cash patronage dividends payable			90,000,000		$ 0	$ 103,900,000
Distribution of patronage refunds			$ 75,776,000		$ 103,879,000
Patronage source earnings, percentage allocated to reserves			10.00%	10.00%	10.00%
Capital equity certificates, number of pools | pools			2
Equity redemptions, age			70 years
Redemptions of equities			$ (85,540,000)	$ (8,847,000)	$ (35,268,000)
Stock Redeemed or Called During Period, Price per Share | $ / shares	$ 28.74
Preferred stock dividends paid			(168,668,000)	(168,668,000)	(167,642,000)
Reclassification of tax effects to capital reserves			0
Class B, Series 1 Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued | shares	695,390
Preferred Stock, Redemption Amount			536,500,000
Fiscal Year 2017 [Domain]
Class of Stock [Line Items]
Estimated payments for redemptions of equities			90,000,000
Accumulated Other Comprehensive Loss
Class of Stock [Line Items]
Reclassification of tax effects to capital reserves			(4,706,000)	(26,992,000)
Capital Reserves
Class of Stock [Line Items]
Estimated patronage refunds			562,398,000	420,330,000	126,333,000
Distribution of patronage refunds			428,756,000	128,831,000	257,468,000
Reclassification of tax effects to capital reserves		$ 27,000,000	4,706,000
Nonqualified Equity Certificates
Class of Stock [Line Items]
Estimated patronage refunds			(472,398,000)	(345,330,000)	126,333,000
Distribution of patronage refunds			(352,980,000)	128,831,000
Qualified Equity Certificates
Class of Stock [Line Items]
Estimated patronage refunds			0
Patronage refunds and capital stock
Class of Stock [Line Items]
Distribution of patronage refunds				428,800,000	128,800,000	$ 257,500,000
Capital Equity Certificates
Class of Stock [Line Items]
Distribution of patronage refunds					$ (153,589,000)
Stock Redeemed or Called During Period, Value	$ 20,000,000
Preferred Stock, Redemption Amount	$ 17,400,000
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Class of Stock [Line Items]
Reclassification of tax effects to capital reserves			$ 983,000	$ (1,468,000)

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