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Aggregate dividends declared during the period for each share of common stock outstanding.

+ 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 S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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- Definition

The day, month, and year (YYYY-MM-DD) that the dividend declared as of or prior to the financial reporting date will be paid in the subsequent period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The aggregate amount of dividends declared, but not paid, as of the financial reporting date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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The day, month and year (YYYY-MM-DD) that the dividend to be paid was declared.

+ References

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- Definition

The date as of when a holder must own the stock to be entitled to the dividend. The ex-dividend date is generally 3 days before the record date.

+ References

No definition available.

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Earnings Per Share And Dividends (Cash Dividends Declared To Common Stockholders) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Earnings Per Share And Dividends [Line Items]
Dividend per Share	$ 0.08	$ 0.07	$ 0.16	$ 0.14
October 20, 2011 [Member]
Earnings Per Share And Dividends [Line Items]
Dividend Declaration Date			Oct. 20, 2011
Dividend per Share			$ 0.08
Total Cash Dividends Declared	$ 17,379		$ 17,379
Date of Record for Dividend Payment			Nov. 15, 2011
Dividend Cash Payment Date			Dec. 01, 2011
January 25, 2012 [Member]
Earnings Per Share And Dividends [Line Items]
Dividend Declaration Date			Jan. 25, 2012
Dividend per Share			$ 0.08
Total Cash Dividends Declared	17,323		17,323
Date of Record for Dividend Payment			Feb. 16, 2012
Dividend Cash Payment Date			Mar. 01, 2012
October 21, 2010 [Member]
Earnings Per Share And Dividends [Line Items]
Dividend Declaration Date				Oct. 21, 2010
Dividend per Share				$ 0.07
Total Cash Dividends Declared		15,563		15,563
Date of Record for Dividend Payment				Nov. 15, 2010
Dividend Cash Payment Date				Dec. 01, 2010
January 19, 2011 [Member]
Earnings Per Share And Dividends [Line Items]
Dividend Declaration Date				Jan. 19, 2011
Dividend per Share				$ 0.07
Total Cash Dividends Declared		$ 15,634		$ 15,634
Date of Record for Dividend Payment				Feb. 15, 2011
Dividend Cash Payment Date				Mar. 01, 2011