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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Mar. 31, 2015
Accounting Policies [Abstract] |
Shares Used in Computing Basic and Diluted Earnings Per Share | Shares used in computing basic and diluted earnings per share are as follows:
|  | Three Months Ended March 31, |  | Six Months Ended March 31,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Denominator (thousands of shares): |  |  |  |  |  |  |  |
Average common shares outstanding for basic computation |  | 173,154 |  |  | 172,760 |  |  | 173,055 |  |  | 172,494 |
Incremental shares issuable for stock options and awards |  | 2,474 |  |  | 2,361 |  |  | 2,660 |  |  | 2,295 |
Average common shares outstanding for diluted computation |  | 175,628 |  |  | 175,121 |  |  | 175,715 |  |  | 174,789 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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