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Selected Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Sep. 30, 2022
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:
 
 
  
Fourth Quarter
 
  
Third Quarter
 
  
Second Quarter
 
  
First Quarter
 
2022
  
  
  
  
Revenue
    $ 1,166,504      $ 1,160,290      $ 1,145,271      $ 1,104,632  
Operating income
      171,686        169,314        163,651        160,146  
Net income
      128,936        128,466        158,497        133,602  
Basic earnings per share
      1.06        1.05        1.29        1.07  
Diluted earnings per share
      1.05        1.04        1.28        1.07  
2021
                                    
Revenue
    $ 1,087,309      $ 1,066,254      $ 1,048,734      $ 1,086,343  
Operating income
      154,330        154,919        149,244        140,200  
Net income
      123,525        146,150        119,067        299,632  
Basic earnings per share
      0.98        1.15        0.92        2.29  
Diluted earnings per share
      0.97        1.14        0.91        2.28