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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Recently Issued Accounting Updates (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2019 | Oct. 01, 2018 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018
New accounting pronouncements |  |  |  |  |
Change in prepaid expenses and other |  |  |  | $ (9,556) | $ (9,623)
Change in noncurrent assets |  |  |  |  | 6,105
Change in accrued liabilities |  |  |  | 8,110 | 40,668
Net cash provided by (used in) operating activities |  |  |  | 659,371 | 371,428
Payment of contingent consideration from acquisition of business |  |  |  | 0 | (10,625)
Cash (used) in financing activities |  |  |  | 242,489 | 241,811
Reclassification of stranded tax effect |  |  | $ 0 | 0 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
New accounting pronouncements |  |  |  |  |
Reclassification of stranded tax effect |  |  | 4,239 | $ 4,239 |
As Reported |  |  |  |  |
New accounting pronouncements |  |  |  |  |
Change in prepaid expenses and other |  |  |  |  | (11,798)
Change in noncurrent assets |  |  |  |  | 5,898
Change in accrued liabilities |  |  |  |  | 30,043
Net cash provided by (used in) operating activities |  |  |  |  | 358,421
Payment of contingent consideration from acquisition of business |  |  |  |  | 0
Cash (used) in financing activities |  |  |  |  | 231,186
ASU 2016-18 | Adjustments |  |  |  |  |
New accounting pronouncements |  |  |  |  |
Change in prepaid expenses and other |  |  |  |  | 2,175
Change in noncurrent assets |  |  |  |  | 207
Change in accrued liabilities |  |  |  |  | 0
Net cash provided by (used in) operating activities |  |  |  |  | 2,382
Payment of contingent consideration from acquisition of business |  |  |  |  | 0
Cash (used) in financing activities |  |  |  |  | 0
ASU 2016-15 | Adjustments |  |  |  |  |
New accounting pronouncements |  |  |  |  |
Change in prepaid expenses and other |  |  |  |  | 0
Change in noncurrent assets |  |  |  |  | 0
Change in accrued liabilities |  |  |  |  | 10,625
Net cash provided by (used in) operating activities |  |  |  |  | 10,625
Payment of contingent consideration from acquisition of business |  |  |  |  | (10,625)
Cash (used) in financing activities |  |  |  |  | $ 10,625
ASU 2018-02 |  |  |  |  |
New accounting pronouncements |  |  |  |  |
Reclassification of stranded tax effect |  |  | $ 4,200 |  |
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
New accounting pronouncements |  |  |  |  |
Reclassification of stranded tax effect | $ 4,239 |  |  |  |
ASU 2016-01 | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
New accounting pronouncements |  |  |  |  |
Reclassification adjustment after-tax |  | $ 29,071 |  |  |
ASU 2016-01 | Adjustments |  |  |  |  |
New accounting pronouncements |  |  |  |  |
Reclassification adjustment before tax |  | 44,000 |  |  |
Reclassification adjustment after-tax |  | $ 29,100 |  |  |

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