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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | $ 2,066,201 | $ 1,990,735 | $ 1,922,795 | $ 1,817,210 | $ 1,990,735 | $ 1,817,210
Other comprehensive (loss) income, before reclassifications, net of tax | 9,992 |  |  |  | 9,992 |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (106) |  | 305 |  | 289 | 609
Other comprehensive income, net of tax | 9,886 | 395 | 305 | 304 | 10,281 | 609
Balance as of end of period | 2,179,225 | 2,066,201 | 2,000,836 | 1,922,795 | 2,179,225 | 2,000,836
Tax on other comprehensive income before reclassifications | (3,020) |  |  |  | (3,020) |
Tax on amounts reclassified from accumulated other comprehensive income (loss) | 32 |  | (93) |  | (87) | (184)
Tax on net current-period other comprehensive income | (2,988) |  |  |  | (3,107) |
Total |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | (9,564) | (9,959) | (4,522) | (4,826) | (9,959) | (4,826)
Other comprehensive income, net of tax | 9,886 | 395 | 305 | 304 |  |
Balance as of end of period | 322 | (9,564) | (4,217) | (4,522) | 322 | (4,217)
Cash Flow Hedges |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | (7,005) | (7,269) | (8,059) | (8,322) | (7,269) | (8,322)
Other comprehensive (loss) income, before reclassifications, net of tax | 0 |  |  |  | 0 |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 262 |  | 264 |  | 526 | 527
Other comprehensive income, net of tax | 262 |  |  |  | 526 |
Balance as of end of period | (6,743) | (7,005) | (7,795) | (8,059) | (6,743) | (7,795)
Tax on other comprehensive income before reclassifications | 0 |  |  |  | 0 |
Tax on amounts reclassified from accumulated other comprehensive income (loss) | (80) |  | (80) |  | (159) | (159)
Tax on net current-period other comprehensive income | (80) |  |  |  | (159) |
Postemployment Benefit Obligation |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | (2,559) | (2,690) | 3,537 | 3,496 | (2,690) | 3,496
Other comprehensive (loss) income, before reclassifications, net of tax | 9,992 |  |  |  | 9,992 |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (368) |  | 41 |  | (237) | 82
Other comprehensive income, net of tax | 9,624 |  |  |  | 9,755 |
Balance as of end of period | 7,065 | $ (2,559) | 3,578 | $ 3,537 | 7,065 | 3,578
Tax on other comprehensive income before reclassifications | (3,020) |  |  |  | (3,020) |
Tax on amounts reclassified from accumulated other comprehensive income (loss) | 112 |  | $ (13) |  | 72 | $ (25)
Tax on net current-period other comprehensive income | $ (2,908) |  |  |  | $ (2,948) |

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