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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Summary of the Retrospective Impact of the Adoption of ASU 2016-15 and ASU 2016-18 (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Consolidated Statements of Cash Flows |  |  |
Change in prepaid expenses and other | $ (176,000) | $ (3,827,000) | $ 29,452,000
Change in noncurrent assets | (10,430,000) | 5,568,000 | 11,550,000
Change in accrued liabilities | 40,887,000 | 43,798,000 | (36,120,000)
Net cash provided by operating activities | 855,751,000 | 557,852,000 | 371,199,000
Payment of contingent consideration from acquisition of business | 0 | (10,625,000) | 0
Net cash used in financing activities | $ (376,329,000) | (319,814,000) | (300,829,000)
Historical Accounting Method |  |  |
Consolidated Statements of Cash Flows |  |  |
Change in prepaid expenses and other |  | (11,218,000) | 24,579,000
Change in noncurrent assets |  | 10,263,000 | 6,855,000
Change in accrued liabilities |  | 33,173,000 |
Net cash provided by operating activities |  | 544,531,000 | 361,631,000
Payment of contingent consideration from acquisition of business |  | 0 |
Net cash used in financing activities |  | (309,189,000) |
Effect of Adoption of ASU No. 2016-15 | Restatement Adjustment |  |  |
Consolidated Statements of Cash Flows |  |  |
Change in prepaid expenses and other |  | 0 | 0
Change in noncurrent assets |  | 0 | 0
Change in accrued liabilities |  | 10,625,000 |
Net cash provided by operating activities |  | 10,625,000 | 0
Payment of contingent consideration from acquisition of business |  | (10,625,000) |
Net cash used in financing activities |  | (10,625,000) | 0
Effect of Adoption of ASU No. 2016-18 | Restatement Adjustment |  |  |
Consolidated Statements of Cash Flows |  |  |
Change in prepaid expenses and other |  | 7,391,000 | 4,873,000
Change in noncurrent assets |  | (4,695,000) | 4,695,000
Change in accrued liabilities |  | 0 |
Net cash provided by operating activities |  | 2,696,000 | $ 9,568,000
Payment of contingent consideration from acquisition of business |  | 0 |
Net cash used in financing activities |  | $ 0 |

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