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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period $ 1,218,535 $ 1,048,098 $ 1,046,721 $ 1,071,176
Other comprehensive income (loss) before reclassifications 1,157 3,896 12,337 2,585
Amounts reclassified from accumulated other comprehensive income (loss) (1,219) 3,049 1,157 10,132
Total other comprehensive (loss) income, net of tax (62) 6,945 13,494 12,717
End of period 1,205,679 1,074,254 1,205,679 1,074,254
Other comprehensive income (loss) before reclassifications, tax expense 400 1,400 4,400 900
Totals        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 22,141 (23,999) 8,585 (29,771)
Total other comprehensive (loss) income, net of tax (62) 6,945 13,494 12,717
End of period 22,079 (17,054) 22,079 (17,054)
Post-retirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 8,807 (1,523) 8,811 (1,562)
Other comprehensive income (loss) before reclassifications 2 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) (2) 20 (4) 59
Total other comprehensive (loss) income, net of tax 0 20 (4) 59
End of period 8,807 (1,503) 8,807 (1,503)
Derivatives designated as cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 13,334 (22,476) (226) (28,209)
Other comprehensive income (loss) before reclassifications 1,155 3,896 12,337 2,585
Amounts reclassified from accumulated other comprehensive income (loss) (1,217) 3,029 1,161 10,073
Total other comprehensive (loss) income, net of tax (62) 6,925 13,498 12,658
End of period $ 13,272 $ (15,551) $ 13,272 $ (15,551)