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, 2015	Aug. 31, 2014	Aug. 31, 2013
Assumptions for benefit obligations:
Discount rate	4.45%	4.15%	4.90%
Assumptions for net periodic benefit cost:
Discount rate	4.15%	4.90%	3.90%
Expected return on plan assets	7.50%	7.65%	7.75%