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Selected Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations | The following are details of the unaudited quarterly results of operations for the three months ended:
|  | September 30, |  |  | June 30, |  |  | March 31, |  |  | December 31, |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 940,656 |  |  | $ | 930,133 |  |  | $ | 925,935 |  |  | $ | 921,505 |
Operating income |  |  | 118,497 |  |  |  | 124,962 |  |  |  | 120,147 |  |  |  | 119,535 |
Net income |  |  | 95,709 |  |  |  | 105,060 |  |  |  | 107,720 |  |  |  | 100,842 |
Basic earnings per share |  |  | 0.65 |  |  |  | 0.71 |  |  |  | 0.72 |  |  |  | 0.67 |
Diluted earnings per share |  |  | 0.64 |  |  |  | 0.70 |  |  |  | 0.71 |  |  |  | 0.66 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 926,776 |  |  | $ | 907,897 |  |  | $ | 902,578 |  |  | $ | 906,287 |
Operating income |  |  | 109,700 |  |  |  | 126,727 |  |  |  | 138,000 |  |  |  | 141,521 |
Net income |  |  | 91,130 |  |  |  | 107,782 |  |  |  | 116,261 |  |  |  | 130,990 |
Basic earnings per share |  |  | 0.60 |  |  |  | 0.70 |  |  |  | 0.75 |  |  |  | 0.84 |
Diluted earnings per share |  |  | 0.59 |  |  |  | 0.69 |  |  |  | 0.74 |  |  |  | 0.83 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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