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Selected Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Sep. 30, 2021
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,
  
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  
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