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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period $ 1,099,124 $ 1,023,533 $ 1,046,721 $ 1,071,176
Other comprehensive income (loss) before reclassifications 7,514 (281) 11,180 (1,312)
Amounts reclassified from accumulated other comprehensive income (loss) 285 3,040 2,376 7,084
Total other comprehensive income, net of tax 7,799 2,759 13,556 5,772
End of period 1,218,535 1,048,098 1,218,535 1,048,098
Other comprehensive income (loss) before reclassifications, tax expense (2,700) 100 (4,000) 500
Totals        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 14,342 (26,758) 8,585 (29,771)
Total other comprehensive income, net of tax 7,799 2,759 13,556 5,772
End of period 22,141 (23,999) 22,141 (23,999)
Post-retirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 8,809 (1,543) 8,811 (1,562)
Other comprehensive income (loss) before reclassifications 0 0 (1) 0
Amounts reclassified from accumulated other comprehensive income (loss) (2) 20 (3) 39
Total other comprehensive income, net of tax (2) 20 (4) 39
End of period 8,807 (1,523) 8,807 (1,523)
Derivatives designated as cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 5,533 (25,215) (226) (28,209)
Other comprehensive income (loss) before reclassifications 7,514 (281) 11,181 (1,312)
Amounts reclassified from accumulated other comprehensive income (loss) 287 3,020 2,379 7,045
Total other comprehensive income, net of tax 7,801 2,739 13,560 5,733
End of period $ 13,334 $ (22,476) $ 13,334 $ (22,476)