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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 55

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Amount of payroll tax expense, compensation, postemployment and benefit-related expenses not elsewhere specified in the taxonomy (such as health plan, profit sharing, incentives, tuition reimbursement, other fringe benefits and perquisites) incurred in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

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Postretirement and Other Employee Benefits - Additional Information (Detail) (USD $)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Pension and Other Postretirement Benefits Disclosure [Line Items]
Accumulated benefit obligation for all defined benefit pension plans	$ 177,056,000	$ 126,310,000
Profit Sharing, 401(k) Plan and Defined Contribution Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions	29,200,000	23,100,000	22,900,000
Minimum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contribution to funded pension plans during fiscal year 2013	4,600,000
Maximum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contribution to funded pension plans during fiscal year 2013	$ 5,000,000
Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Target allocation percentage	35.00%
Debt Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Target allocation percentage	65.00%