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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Mar. 31, 2017
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,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Denominator (thousands of shares): |  |  |  |  |  |  |  |
Weighted-average common shares outstanding — basic |  | 173,624 |  |  | 172,619 |  |  | 173,567 |  |  | 172,733 |
Incremental shares issuable for stock options and awards (a) |  | 3,512 |  |  | 2,226 |  |  | 3,409 |  |  | 2,220 |
Weighted-average common shares outstanding — diluted |  | 177,136 |  |  | 174,845 |  |  | 176,976 |  |  | 174,953 |
(a) | See “Adoption of New Accounting Standard — Employee Share-based Payments” below for the impact on the calculation of diluted shares for the three and six months ended March 31, 2017 resulting from the adoption of new accounting guidance regarding share-based payments.

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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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