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Common Stock Data (Details) (USD $) | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011
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Maximum [Member] |  |  |  |  |  |  |  |
Sales price of common stock | $ 65.52 | $ 58.49 | $ 57.07 | $ 57.97 | $ 63.02 | $ 63.11 | $ 59.45 | $ 66.49
Minimum [Member] |  |  |  |  |  |  |  |
Sales price of common stock | $ 54.05 | $ 49.98 | $ 48.56 | $ 50.79 | $ 41.29 | $ 54.95 | $ 46.36 | $ 46.63

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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant