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Pensions and Other Postretirement Benefits - Fair Value of Pension Plan's Assets by Major Asset Category (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012	Aug. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 42,072	$ 36,328
Fair value of plan assets	42,072
Common Collective Trust Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,970
Real Estate Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,102
Fair value of plan assets	2,102	677
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 [Member] \| Common Collective Trust Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 1 [Member] \| Real Estate Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,970
Level 2 [Member] \| Common Collective Trust Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,970
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,102
Level 3 [Member] \| Real Estate Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,102

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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