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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Recent Accounting Pronouncements and Analysis of the Effects on the Financial Statements (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net cash provided by operating activities |  |  | $ 855,751,000 | $ 557,852,000 | $ 371,199,000
Net cash used in financing activities |  |  | $ (376,329,000) | (319,814,000) | (300,829,000)
ASU 2016-18 | Adjustments |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net cash provided by operating activities |  |  |  | 2,696,000 | 9,568,000
Net cash used in financing activities |  |  |  | 0 |
ASU 2016-15 | Adjustments |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net cash provided by operating activities |  |  |  | 10,625,000 | 0
Net cash used in financing activities |  |  |  | $ (10,625,000) | $ 0
ASU 2016-01 | Adjustments |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification of cumulative gains, before tax | $ 44,000,000 |  |  |  |
Reclassification of cumulative gains, after tax | $ 29,100,000 |  |  |  |
ASU 2018-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification of stranded tax effect |  | $ 4,200,000 |  |  |

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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