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Capital Stock and Share Repurchase Share Repurchase (Details) - USD ($) $ in Millions | Nov. 30, 2017 | Aug. 31, 2017
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Equity [Abstract] |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 7,560,566 |
Treasury Stock, Shares | 20,439,434 | 20,439,434
Stock Repurchase Program, Authorized Amount | $ 617.7 |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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