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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | $ 1,817,210 | $ 1,630,862
Amounts reclassified from accumulated other comprehensive income, net of tax | 304 | 1,030
Balance as of end of period | 1,922,795 | 1,716,978
Tax on amounts reclassified from accumulated other comprehensive income | (91) | (312)
Cash Flow Hedges |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (8,322) | (9,376)
Amounts reclassified from accumulated other comprehensive income, net of tax | 263 | 264
Balance as of end of period | (8,059) | (9,112)
Tax on amounts reclassified from accumulated other comprehensive income | (79) | (79)
Postemployment Benefit Obligation |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | 3,496 | (25,152)
Amounts reclassified from accumulated other comprehensive income, net of tax | 41 | 766
Balance as of end of period | 3,537 | (24,386)
Tax on amounts reclassified from accumulated other comprehensive income | (12) | (233)
Total |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (4,826) | (34,528)
Balance as of end of period | $ (4,522) | $ (33,498)

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