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Credit Arrangements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014 Standby Letters of Credit [Member]	Aug. 31, 2014 Wells Fargo Bank NA (Revolving Credit Agreement)[Member]	Aug. 31, 2014 Credit Facility Agreement [Member]	Aug. 22, 2014 Credit Facility Agreement [Member]	Aug. 31, 2014 Revolving Credit Facility [Member]	Aug. 31, 2014 Revolving Credit Facility [Member] Wells Fargo Bank NA (Revolving Credit Agreement)[Member]	Jan. 23, 2011 Revolving Credit Facility [Member] Wells Fargo Bank NA (Revolving Credit Agreement)[Member]
Debt Instrument [Line Items]
Outstanding debt	$ 0	$ 0
Unsecured revolving line of credit, maximum borrowing capacity						5.0	24.5
Unsecured revolving line of credit, amount outstanding					0
Basis points					1.15%			0.90%
Interest rate				1.06%	1.31%
Annual commitment fee	0.25%				0.25%
Consideration for standby letters of credit			5.5
Unsecured term note and credit agreement									$ 30.0

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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X

- Definition

The effective interest rate at the end of the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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X

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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-Publisher FASB

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- Definition

Amount of payments made reducing loss contingency liability.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

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- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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