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Selected Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2020
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, |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 1,052,948 |  |  | $ | 1,026,201 |  |  | $ | 1,047,933 |  |  | $ | 1,041,957 |
Operating income |  |  | 146,938 |  |  |  | 147,531 |  |  |  | 156,712 |  |  |  | 143,577 |
Net income |  |  | 134,463 |  |  |  | 120,407 |  |  |  | 127,038 |  |  |  | 115,932 |
Basic earnings per share |  |  | 1.02 |  |  |  | 0.90 |  |  |  | 0.95 |  |  |  | 0.86 |
Diluted earnings per share |  |  | 1.01 |  |  |  | 0.90 |  |  |  | 0.94 |  |  |  | 0.85 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 1,030,253 |  |  | $ | 1,024,704 |  |  | $ | 1,019,657 |  |  | $ | 1,012,055 |
Operating income |  |  | 144,154 |  |  |  | 142,320 |  |  |  | 150,175 |  |  |  | 133,097 |
Net income |  |  | 122,027 |  |  |  | 131,448 |  |  |  | 124,279 |  |  |  | 101,692 |
Basic earnings per share |  |  | 0.90 |  |  |  | 0.96 |  |  |  | 0.90 |  |  |  | 0.73 |
Diluted earnings per share |  |  | 0.90 |  |  |  | 0.96 |  |  |  | 0.90 |  |  |  | 0.72 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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