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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Mar. 31, 2016
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,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Denominator (thousands of shares): |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  | 172,619 |  |  | 173,154 |  |  | 172,733 |  |  | 173,055 |
Incremental shares issuable for stock options and awards |  | 2,226 |  |  | 2,474 |  |  | 2,220 |  |  | 2,660 |
Weighted-average common shares outstanding - diluted |  | 174,845 |  |  | 175,628 |  |  | 174,953 |  |  | 175,715 |

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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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