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Share Repurchase Plans (Details) (USD $)	12 Months Ended				13 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2014 Two Thousand Thirteen Share Repurchase Program [Member]	Aug. 31, 2014 Two Thousand Thirteen Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share buy-back plan, amount authorized				$ 60,000,000
Share buy-back plan, number of shares repurchased					648,138
Total cost of repurchased shares	$ 42,773,000	$ 31,437,000	$ 39,840,000		$ 45,400,000

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

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