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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | $ 1,784,287 | $ 1,821,833 | $ 1,630,862 | $ 1,643,896
Amounts reclassified from accumulated other comprehensive income, net of tax | 1,030 | 1,076 | 3,091 | 3,195
Balance as of end of period | 1,768,683 | 1,682,066 | 1,768,683 | 1,682,066
Tax on amounts reclassified from accumulated other comprehensive income | (311) | (324) | (935) | (1,004)
Cash Flow Hedges |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (8,849) | (9,903) | (9,376) | (10,397)
Amounts reclassified from accumulated other comprehensive income, net of tax | 262 | 264 | 789 | 758
Balance as of end of period | (8,587) | (9,639) | (8,587) | (9,639)
Tax on amounts reclassified from accumulated other comprehensive income | (79) | (79) | (238) | (270)
Postemployment Benefit Obligation |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (23,618) | (32,293) | (25,152) | (33,918)
Amounts reclassified from accumulated other comprehensive income, net of tax | 768 | 812 | 2,302 | 2,437
Balance as of end of period | (22,850) | (31,481) | (22,850) | (31,481)
Tax on amounts reclassified from accumulated other comprehensive income | (232) | (245) | (697) | (734)
Total |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (32,467) | (42,196) | (34,528) | (44,315)
Balance as of end of period | $ (31,437) | $ (41,120) | $ (31,437) | $ (41,120)

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