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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - IMPACT OF ASC 740 ON THE UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Depreciation and amortization | $ 27,767 | $ 27,872 | $ 81,977 | $ 80,025
Deferred income taxes |  |  | $ 4,816 | 27,014
As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Depreciation and amortization |  | 31,216 |  | 89,758
Deferred income taxes |  |  |  | (3,066)
Effect of Change |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Depreciation and amortization |  | $ (3,344) |  | (9,733)
Deferred income taxes |  |  |  | $ 30,080

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