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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | $ 1,821,833 | $ 1,654,737 | $ 1,643,896 | $ 1,345,615
Balance as of end of period | 1,682,066 | 1,612,478 | 1,682,066 | 1,612,478
Cash Flow Hedges |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (9,903) | (9,711) | (10,397) | 0
Other comprehensive (loss) income, before reclassifications, net of tax |  | (626) |  | (10,337)
Amounts reclassified from accumulated other comprehensive income, net of tax | 264 | 0 | 758 | 0
Net current-period, other comprehensive income, net of tax |  | (626) |  | (10,337)
Balance as of end of period | (9,639) | (10,337) | (9,639) | (10,337)
Tax on amounts reclassified from accumulated other comprehensive income | (79) | 0 | (270) | 0
Other comprehensive income (loss) before reclassifications, tax |  | 180 |  | 2,961
Other comprehensive income (loss), tax |  | 180 |  | 2,961
Postemployment Benefit Obligation |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (32,293) | (24,928) | (33,918) | (31,787)
Other comprehensive (loss) income, before reclassifications, net of tax |  | 0 |  | 5,378
Amounts reclassified from accumulated other comprehensive income, net of tax | 812 | 663 | 2,437 | 2,144
Net current-period, other comprehensive income, net of tax |  | 663 |  | 7,522
Balance as of end of period | (31,481) | (24,265) | (31,481) | (24,265)
Tax on amounts reclassified from accumulated other comprehensive income | (245) | (191) | (734) | (480)
Other comprehensive income (loss) before reclassifications, tax |  | 0 |  | (1,681)
Other comprehensive income (loss), tax |  | (191) |  | (2,161)
Total |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (42,196) | (34,639) | (44,315) | (31,787)
Other comprehensive (loss) income, before reclassifications, net of tax |  | (626) |  | (4,959)
Amounts reclassified from accumulated other comprehensive income, net of tax | 1,076 | 663 | 3,195 | 2,144
Net current-period, other comprehensive income, net of tax |  | 37 |  | (2,815)
Balance as of end of period | (41,120) | (34,602) | (41,120) | (34,602)
Tax on amounts reclassified from accumulated other comprehensive income | $ (324) | (191) | $ (1,004) | (480)
Other comprehensive income (loss) before reclassifications, tax |  | 180 |  | 1,280
Other comprehensive income (loss), tax |  | $ (11) |  | $ 800

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