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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