Postretirement and Other Employee Benefits (Benefit Obligations and Plan Assets, Changes in Benefit Obligation and Plan Assets and Funded Status of Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Change in projected benefit obligation
Beginning projected benefit obligation	$ 174,690	$ 161,104
Service cost	24,606	1,437	$ 1,063
Interest cost	3,041	3,715	3,807
Actuarial (gain) loss	(81,409)	19,060
Settlements paid from plan assets	(25,749)	0
Total benefits paid	(6,431)	(6,568)
Plan participants’ contributions	14,171	35
Acquisitions	404,297	6,040
Effect of conversion to U.S. dollars	51,887	(10,133)
Ending projected benefit obligation	559,103	174,690	161,104
Change in plan assets
Beginning fair value of plan assets	158,101	151,715
Actual return on plan assets	6,952	19,784
Acquisitions	330,793	0
Settlements paid from plan assets	(25,749)	0
Employer contributions	10,084	1,717
Benefits paid from plan assets	(5,765)	(5,435)
Plan participants’ contributions	14,171	35
Effect of conversion to U.S. dollars	49,686	(9,715)
Ending fair value of plan assets	538,273	158,101	$ 151,715
Unfunded status	(20,830)	(16,589)
Amounts recognized in the Consolidated Balance Sheets
Accrued benefit liability, current	646	368
Accrued benefit liability, noncurrent	20,184	16,221
Accumulated other comprehensive loss
Actuarial (gain) loss, before tax	(49,054)	24,343
Prior service cost, before tax	786	$ 690
Net actuarial gain expected to be amortized to net period benefit cost in next fiscal year	5,100
Prior service cost expected to be amortized to net periodic benefit cost in next fiscal year	$ 0