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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Property and equipment      
Property and equipment, gross $ 1,348,100 $ 1,298,700  
Accumulated depreciation and amortization (734,000) (677,300)  
Property and equipment, net 614,062 621,357  
Depreciation expense 158,500 157,100 $ 171,700
Building and land      
Property and equipment      
Property and equipment, gross 75,200 63,600  
Leasehold improvements      
Property and equipment      
Property and equipment, gross 399,200 404,600  
Computer systems and equipment      
Property and equipment      
Property and equipment, gross 741,200 694,600  
Furniture and Fixtures      
Property and equipment      
Property and equipment, gross $ 132,500 $ 135,900