Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Assumptions for net periodic benefit cost:
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment			$ (1.7)
Equity
Assumptions for net periodic benefit cost:
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	30.00%
Fixed Income Securities
Assumptions for net periodic benefit cost:
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	70.00%
Domestic Plan Member
Assumptions for benefit obligations:
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.75%	2.55%	2.40%
Assumptions for net periodic benefit cost:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.55%	2.40%	2.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	5.45%	4.20%	4.60%