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Benefit Plans - Net Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Qualified Pension Benefits
Component of net periodic benefit costs: [Abstract]
Service costs	$ 7,216	$ 6,501	$ 14,432	$ 13,003
Interest costs	6,501	5,909	13,006	11,844
Expected return on assets	(11,967)	(9,985)	(23,923)	(20,009)
Prior service cost (credit) amortization	400	458	799	916
Actuarial loss (gain) amortization	5,230	3,744	10,461	7,476
Transition amount amortization
Periodic benefit costs, net	7,380	6,627	14,775	13,230
Defined Benefit Plan, Contributions by Employer			0
Non-Qualified Pension Benefits
Component of net periodic benefit costs: [Abstract]
Service costs	164	(31)	329	141
Interest costs	324	348	647	696
Expected return on assets
Prior service cost (credit) amortization	57	57	114	114
Actuarial loss (gain) amortization	211	113	422	225
Transition amount amortization
Periodic benefit costs, net	756	487	1,512	1,176
Other Benefits
Component of net periodic benefit costs: [Abstract]
Service costs	634	511	1,267	1,021
Interest costs	616	637	1,232	1,273
Expected return on assets
Prior service cost (credit) amortization	(5)	(26)	(9)	(52)
Actuarial loss (gain) amortization	223	206	446	413
Transition amount amortization	174	234	349	468
Periodic benefit costs, net	$ 1,642	$ 1,562	$ 3,285	$ 3,123

X

- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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- Definition

The amount of the transition obligation or asset recognized in net periodic benefit cost.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

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

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-Glossary Expected Return on Plan Assets

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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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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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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

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-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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