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 |