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Subsequent Events (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2013 | May 31, 2012 | May 31, 2013 | May 31, 2012
Subsequent Event [Line Items] |  |  |  |
Cash dividend declared | $ 0.31 | $ 0.29 | $ 0.91 | $ 0.85
Subsequent Events [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash dividend declared |  |  | $ 0.31 |
Dividend payable date |  |  | Jul. 31, 2013 |
Dividend payable record date |  |  | Jul. 16, 2013 |
Two Thousand Thirteen Share Repurchase Program [Member] | Subsequent Events [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock Repurchase Program Authorized Amount |  |  | $ 60.0 |

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- Definition 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 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + 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 Reference 2: 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Details
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