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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Jun. 30, 2018
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 June 30, |  | Nine Months Ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Denominator (thousands of shares): |  |  |  |  |  |  |  |
Weighted-average common shares outstanding — basic |  | 173,991 |  |  | 173,742 |  |  | 173,744 |  |  | 173,625 |
Incremental shares issuable for stock options and awards (a) |  | 2,816 |  |  | — |  |  | 2,958 |  |  | 3,500 |
Weighted-average common shares outstanding — diluted |  | 176,807 |  |  | 173,742 |  |  | 176,702 |  |  | 177,125 |
(a) | For the three months ended June 30, 2018 and the nine months ended June 30, 2018 and 2017, there were no shares associated with outstanding stock option awards that were excluded in the computation of diluted earnings per share above because their effect was antidilutive. For the three months ended June 30, 2017, incremental shares of 3,556 have been excluded due to the net loss for the period.

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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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