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Postretirement and Other Employee Benefits (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Retirement Benefits [Abstract]
Service cost	$ 6,453	$ 6,638	$ 12,531	$ 11,101
Interest cost	1,176	809	2,297	1,572
Expected long-term return on plan assets	(3,979)	(3,789)	(7,849)	(6,575)
Recognized actuarial (gain) loss	(1,270)	226	(2,513)	449
Amortization of actuarial gains	(1,766)	0	(3,490)	0
Amortization of prior service credit	(13)	(11)	(26)	(22)
Net periodic benefit cost	$ 601	$ 3,873	$ 950	$ 6,525

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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