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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 | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Depreciation and amortization | $ 107,368 | $ 81,109 | $ 76,571
Deferred income taxes | 34,346 | (2,822) | 27,143
Cash flows from operating activities | 213,481 | 194,128 | 398,286
Previously Reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Depreciation and amortization | 119,894 | 91,730 | 85,701
Deferred income taxes | (9,092) | (59,013) | 15,590
Effect of Change |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Depreciation and amortization | (12,526) | (10,621) | (9,130)
Deferred income taxes | $ 43,438 | $ 56,191 | $ 11,553

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