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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Dec. 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 December 31,
|  | 2016 |  | 2015
Denominator (thousands of shares): |  |  |  |
Weighted-average common shares outstanding — basic |  | 173,512 |  |  | 172,862 |
Incremental shares issuable for stock options and awards |  | 3,472 |  | (a) | 2,356 |
Weighted-average common shares outstanding — diluted |  | 176,984 |  |  | 175,218 |
(a) | See “Adoption of New Accounting Standard - Employee Share-based Payments” below for the impact on the calculation of diluted shares 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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