Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail) - Domestic Plan Member	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Assumptions for benefit obligations:
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.40%	2.90%	4.05%
Assumptions for net periodic benefit cost:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.90%	4.05%	3.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	4.60%	5.75%	7.00%