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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year $ 1,071,176    
Other comprehensive income (loss) before reclassifications 25,326 $ 952 $ (36,440)
Amounts reclassified from accumulated other comprehensive loss 13,030 15,278 1,629
Total other comprehensive (loss) income, net of tax 38,356 16,230 (34,811)
End of year 1,046,070 1,071,176  
Tax expense (benefit) (5,300) (500) 14,600
Post-retirement plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year (1,562) (4,127) (9,068)
Other comprehensive income (loss) before reclassifications 10,294 2,481 4,860
Amounts reclassified from accumulated other comprehensive loss 79 84 81
Total other comprehensive (loss) income, net of tax 10,373 2,565 4,941
End of year 8,811 (1,562) (4,127)
Derivatives designated as cash flow hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year (28,209) (41,874) (2,122)
Other comprehensive income (loss) before reclassifications 15,032 (1,529) (41,300)
Amounts reclassified from accumulated other comprehensive loss 12,951 15,194 1,548
Total other comprehensive (loss) income, net of tax 27,983 13,665 (39,752)
End of year (226) (28,209) (41,874)
Totals      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year (29,771) (46,001) (11,190)
End of year $ 8,585 $ (29,771) $ (46,001)