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Valuation and Qualifying Accounts (Details) - Allowance For Doubtful Accounts Member - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 14,795 $ 10,865 $ 11,056
Charged to cost & expenses 17,633 14,894 12,269
Charged to other accounts 0 0 0
Deductions 16,529 10,964 12,460
Balance at end of period $ 15,899 $ 14,795 $ 10,865