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Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail) - United States Pension Plan of US Entity
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Assumptions for benefit obligations:      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.60% 3.45% 4.45%
Assumptions for net periodic benefit cost:      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.45% 4.45% 4.15%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.15% 7.40% 7.50%