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Assumed Health Care Cost Trend Rates (Detail)	12 Months Ended
Assumed Health Care Cost Trend Rates (Detail)	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Current health care trend assumption	8.00%	8.00%	8.00%
Ultimate health care trend rate	4.50%	4.50%	4.50%
Year ultimate health care trend is reached	2030	2029	2028

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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