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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | $ 1,922,795 | $ 1,716,978 | $ 1,817,210 | $ 1,630,862
Amounts reclassified from accumulated other comprehensive income, net of tax | 305 | 1,031 | 609 | 2,061
Balance as of end of period | 2,000,836 | 1,784,287 | 2,000,836 | 1,784,287
Tax on amounts reclassified from accumulated other comprehensive income | (93) | (312) | (184) | (624)
Cash Flow Hedges |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (8,059) | (9,112) | (8,322) | (9,376)
Amounts reclassified from accumulated other comprehensive income, net of tax | 264 | 263 | 527 | 527
Balance as of end of period | (7,795) | (8,849) | (7,795) | (8,849)
Tax on amounts reclassified from accumulated other comprehensive income | (80) | (80) | (159) | (159)
Postemployment Benefit Obligation |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | 3,537 | (24,386) | 3,496 | (25,152)
Amounts reclassified from accumulated other comprehensive income, net of tax | 41 | 768 | 82 | 1,534
Balance as of end of period | 3,578 | (23,618) | 3,578 | (23,618)
Tax on amounts reclassified from accumulated other comprehensive income | (13) | (232) | (25) | (465)
Total |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (4,522) | (33,498) | (4,826) | (34,528)
Balance as of end of period | $ (4,217) | $ (32,467) | $ (4,217) | $ (32,467)

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