Annual report pursuant to Section 13 and 15(d)

Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)

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Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   2.00%  
Pension Plans, Defined Benefit | UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.90% 4.05% 3.60%
Assumptions for net periodic benefit cost:      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.05% 3.60% 3.45%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 5.75% 7.00% 7.15%
Pension Plans, Defined Benefit | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 1.10%