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Selected Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Sep. 30, 2017
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,  

2017

            

Revenue

    $ 979,724      $ 966,695      $ 966,009      $ 954,727  

Operating income

      132,047        129,912        133,781        121,593  

Net income

      107,209        119,264        112,560        97,793  

Basic earnings per share

      0.74        0.82        0.77        0.67  

Diluted earnings per share

      0.73        0.81        0.76        0.66  

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