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Additional Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 25, 2020 | Dec. 26, 2019 | Dec. 16, 2019 | Sep. 23, 2019 | Jun. 28, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Interest payments |  |  |  |  |  |  | $ 43,000 | $ 50,000 | $ 108,000 | $ 120,000
Income and withholding taxes paid |  |  |  |  |  |  | 18,000 | 22,000 | $ 58,000 | 40,000
Quarterly dividends (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.12 |
Quarterly dividends | $ 37,500 | $ 37,500 | $ 37,500 | $ 206,000 | $ 31,250 |  |  |  |  |
Depreciation expense |  |  |  |  |  |  | $ 15,000 | $ 15,000 | $ 53,000 | $ 43,000
One-time charge |  |  |  |  |  |  |  |  | $ 10,000 |
Access Industries |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Termination and Transaction Services Fee |  |  |  |  |  | $ 60,000 |  |  |  |

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