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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) (Pension Plans, Defined Benefit, USD $)	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	$ 822,125,000	$ 730,628,000	$ 688,196,000
Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	227,506,000	190,378,000
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	4,218,000	667,000
Level 1 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	84,830,000	113,982,000
Level 1 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	138,458,000	75,729,000
Level 1 | Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Level 1 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	583,168,000	516,629,000
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	66,485,000	80,619,000
Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	488,526,000	409,996,000
Level 2 | Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	28,157,000	26,014,000
Level 2 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	11,451,000	23,621,000
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Level 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	0	0
Level 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	1,749,000	1,940,000
Level 3 | Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	9,492,000	3,403,000
Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	210,000	18,278,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	822,125,000	730,628,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	4,218,000	667,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	151,315,000	194,601,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	628,733,000	487,665,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Partnership and joint venture interests
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	37,649,000	29,417,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans assets, fair value	$ 210,000	$ 18,278,000

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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