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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Property and equipment      
Property and equipment, gross $ 1,366,100 $ 1,348,100  
Accumulated depreciation and amortization (806,700) (734,000)  
Property and equipment, net 559,399 614,062  
Depreciation expense 164,500 158,500 $ 157,100
Building and land      
Property and equipment      
Property and equipment, gross 44,700 75,200  
Leasehold improvements      
Property and equipment      
Property and equipment, gross 394,900 399,200  
Computer systems and equipment      
Property and equipment      
Property and equipment, gross 788,200 741,200  
Furniture and Fixtures      
Property and equipment      
Property and equipment, gross $ 138,300 $ 132,500