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Benefit Plans - Schedule of the Effect a Percentage Point Change in the Assumed Health Care Cost Trend Rates (Details) $ in Thousands	12 Months Ended
	Aug. 31, 2015 USD ($)
Compensation and Retirement Disclosure [Abstract]
Effect on total of service and interest cost components (1% increase)	$ 500
Effect on total of service and interest cost components (1% decrease)	(380)
Effect on postretirement benefit obligation (1% increase)	3,600
Effect on postretirement benefit obligation (1% decrease)	$ (3,200)

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ 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 (m)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ 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 (m)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ 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 (m)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ 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 (m)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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