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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, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | $ 1,698,214 | $ 1,608,092 | $ 1,643,896 | $ 1,345,615
Balance as of end of period | 1,821,833 | 1,654,737 | 1,821,833 | 1,654,737
Cash Flow Hedges |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (10,166) | 0 | (10,397) | 0
Other comprehensive (loss) income, before reclassifications, net of tax |  | (9,711) |  | (9,711)
Amounts reclassified from accumulated other comprehensive income, net of tax | 263 | 0 | 494 | 0
Net current-period, other comprehensive income, net of tax |  | (9,711) |  | (9,711)
Balance as of end of period | (9,903) | (9,711) | (9,903) | (9,711)
Tax on amounts reclassified from accumulated other comprehensive income | (79) | 0 | (191) | 0
Other comprehensive income (loss), tax |  | 2,781 |  | 2,781
Other comprehensive income (loss) before reclassifications, tax |  | 2,781 |  | 2,781
Postemployment Benefit Obligation |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (33,106) | (31,028) | (33,918) | (31,787)
Other comprehensive (loss) income, before reclassifications, net of tax |  | 5,378 |  | 5,378
Amounts reclassified from accumulated other comprehensive income, net of tax | 813 | 722 | 1,625 | 1,481
Net current-period, other comprehensive income, net of tax |  | 6,100 |  | 6,859
Balance as of end of period | (32,293) | (24,928) | (32,293) | (24,928)
Tax on amounts reclassified from accumulated other comprehensive income | (244) | (72) | (489) | (289)
Other comprehensive income (loss), tax |  | (1,753) |  | (1,970)
Other comprehensive income (loss) before reclassifications, tax |  | (1,681) |  | (1,681)
Total |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (43,272) | (31,028) | (44,315) | (31,787)
Other comprehensive (loss) income, before reclassifications, net of tax |  | (4,333) |  | (4,333)
Amounts reclassified from accumulated other comprehensive income, net of tax | 1,076 | 722 | 2,119 | 1,481
Net current-period, other comprehensive income, net of tax |  | (3,611) |  | (2,852)
Balance as of end of period | (42,196) | (34,639) | (42,196) | (34,639)
Tax on amounts reclassified from accumulated other comprehensive income | $ (323) | (72) | $ (680) | (289)
Other comprehensive income (loss), tax |  | 1,028 |  | 811
Other comprehensive income (loss) before reclassifications, tax |  | $ 1,100 |  | $ 1,100

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