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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Oct. 01, 2018
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period | $ 1,889,107 | $ 1,569,162 | $ 1,551,717 | $ 1,418,978 |
Balance as of end of period | 1,838,927 | 1,572,197 | 1,838,927 | 1,572,197 |
Investments in Equity Securities |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period | 0 | 0 | 0 | 3,446 |
Other comprehensive (loss) income, before reclassifications, net of tax | 0 |  | 0 |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | 0 | 0 | 0 | 0 |
Net current-period, other comprehensive income, net of tax | 0 |  | 0 |  |
Reclassification to retained earnings |  |  |  |  | $ (3,446)
Balance as of end of period | 0 | 0 | 0 | 0 |
Other comprehensive income (loss) before reclassifications, tax | 0 |  | 0 |  |
Tax on amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0 |
Other comprehensive income (loss), tax | 0 |  | 0 |  |
Cash Flow Hedges |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period | (9,711) | 0 | 0 | 0 |
Other comprehensive (loss) income, before reclassifications, net of tax | (626) |  | (10,337) |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | 0 | 0 | 0 | 0 |
Net current-period, other comprehensive income, net of tax | (626) |  | (10,337) |  |
Reclassification to retained earnings |  |  |  |  |
Balance as of end of period | (10,337) | 0 | (10,337) | 0 |
Other comprehensive income (loss) before reclassifications, tax | 180 |  | 2,961 |  |
Tax on amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0 |
Other comprehensive income (loss), tax | 180 |  | 2,961 |  |
Postemployment Benefit Obligation |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period | (24,928) | (15,517) | (31,787) | (16,056) |
Other comprehensive (loss) income, before reclassifications, net of tax | 0 |  | 5,378 |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | 663 | 305 | 2,144 | 844 |
Net current-period, other comprehensive income, net of tax | 663 |  | 7,522 |  |
Reclassification to retained earnings |  |  |  |  | 0
Balance as of end of period | (24,265) | (15,212) | (24,265) | (15,212) |
Other comprehensive income (loss) before reclassifications, tax | 0 |  | (1,681) |  |
Tax on amounts reclassified from accumulated other comprehensive income | (191) | (118) | (480) | (333) |
Other comprehensive income (loss), tax | (191) |  | (2,161) |  |
Total |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period | (34,639) | (15,517) | (31,787) | (12,610) |
Other comprehensive (loss) income, before reclassifications, net of tax | (626) |  | (4,959) |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | 663 | 305 | 2,144 | 844 |
Net current-period, other comprehensive income, net of tax | 37 |  | (2,815) |  |
Reclassification to retained earnings |  |  |  |  | $ (3,446)
Balance as of end of period | (34,602) | (15,212) | (34,602) | (15,212) |
Other comprehensive income (loss) before reclassifications, tax | 180 |  | 1,280 |  |
Tax on amounts reclassified from accumulated other comprehensive income | (191) | $ (118) | (480) | $ (333) |
Other comprehensive income (loss), tax | $ (11) |  | $ 800 |  |

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