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Earnings Per Share (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 24 Months Ended |  |  | 3 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2013 | Aug. 31, 2012 | Oct. 10, 2013 | Jul. 30, 2013 | Oct. 18, 2011 | Aug. 31, 2013 Employee payroll taxes due on restricted stock [Member] | Oct. 10, 2013 Subsequent Event [Member]
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Options granted excluded from the computation of diluted earnings per share (shares) | 600,000 | 800,000 |  |  |  |  |
Additional amount authorized under share buyback program |  |  |  | 500,000,000 | 500,000,000 |  |
Common stock purchased under a share buyback program (shares) | 2,100,000 |  | 11,400,000 |  |  | 100,000 | 900,000
Aggregate purchase price of common stock under a share buyback program | $ 100.8 |  | $ 484.6 |  |  | $ 6.2 | $ 46.3
Average price of common stock purchased under a share buyback program (dollars per share) |  |  | $ 42.44 |  |  | $ 47.67 |

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- Definition Represents the average price of common stock that has been repurchased during the period under share repurchase program. + References No definition available. + Details
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- Definition The new amount authorized by the entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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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 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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, 31 -Article 5 + Details
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