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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | $ 1,630,862 | $ 1,643,896
Balance as of end of period | 1,716,978 | 1,698,214
Cash Flow Hedges |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (9,376) | (10,397)
Amounts reclassified from accumulated other comprehensive income, net of tax | 264 | 231
Balance as of end of period | (9,112) | (10,166)
Tax on amounts reclassified from accumulated other comprehensive income | (79) | (112)
Postemployment Benefit Obligation |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (25,152) | (33,918)
Amounts reclassified from accumulated other comprehensive income, net of tax | 766 | 812
Balance as of end of period | (24,386) | (33,106)
Tax on amounts reclassified from accumulated other comprehensive income | (233) | (245)
Total |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (34,528) | (44,315)
Amounts reclassified from accumulated other comprehensive income, net of tax | 1,030 | 1,043
Balance as of end of period | (33,498) | (43,272)
Tax on amounts reclassified from accumulated other comprehensive income | $ (312) | $ (357)

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