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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Depreciation and amortization | $ 26,848 | $ 27,516 | $ 54,210 | $ 52,153
Deferred income taxes |  |  | $ 20,909 | 34,975
As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Depreciation and amortization |  | 30,784 |  | 58,542
Deferred income taxes |  |  |  | 318
Effect of Change |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Depreciation and amortization |  | $ (3,268) |  | (6,389)
Deferred income taxes |  |  |  | $ 34,657

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