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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Dec. 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 December 31,
|  | 2017 |  | 2016
Denominator (thousands of shares): |  |  |  |
Weighted-average common shares outstanding — basic |  | 173,670 |  |  | 173,512 |
Incremental shares issuable for stock options and awards (a) |  | 3,278 |  |  | 3,472 |
Weighted-average common shares outstanding — diluted |  | 176,948 |  |  | 176,984 |
(a) | For the three months ended December 31, 2017, there were 146 shares associated with outstanding stock option awards that were not included in the computation of diluted earnings per share above because their effect was antidilutive. For the three months ended December 31, 2016, there were no such antidilutive shares.

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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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