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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | $ 2,000,836 | $ 1,784,287 | $ 1,817,210 | $ 1,630,862
Amounts reclassified from accumulated other comprehensive income, net of tax | 304 | 1,030 | 913 | 3,091
Balance as of end of period | 1,995,242 | 1,768,683 | 1,995,242 | 1,768,683
Tax on amounts reclassified from accumulated other comprehensive income | (91) | (311) | (275) | (935)
Cash Flow Hedges |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (7,795) | (8,849) | (8,322) | (9,376)
Amounts reclassified from accumulated other comprehensive income, net of tax | 263 | 262 | 790 | 789
Balance as of end of period | (7,532) | (8,587) | (7,532) | (8,587)
Tax on amounts reclassified from accumulated other comprehensive income | (79) | (79) | (238) | (238)
Postemployment Benefit Obligation |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | 3,578 | (23,618) | 3,496 | (25,152)
Amounts reclassified from accumulated other comprehensive income, net of tax | 41 | 768 | 123 | 2,302
Balance as of end of period | 3,619 | (22,850) | 3,619 | (22,850)
Tax on amounts reclassified from accumulated other comprehensive income | (12) | (232) | (37) | (697)
Total |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (4,217) | (32,467) | (4,826) | (34,528)
Balance as of end of period | $ (3,913) | $ (31,437) | $ (3,913) | $ (31,437)

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