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Accumulated Other Comprehensive Income / (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period $ 1,083,941 $ 1,017,071 $ 1,046,562 $ 992,002
Other comprehensive income (loss) before reclassifications (5,788) 2,344 (5,240) 8,700
Amounts reclassified from accumulated other comprehensive income (1,891) (3,143) (4,568) (6,141)
Total other comprehensive (loss) income, net of tax (7,679) (799) (9,808) 2,559
End of period 1,200,769 1,072,130 1,200,769 1,072,130
Totals        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 7,403 32,691 9,532 29,333
Total other comprehensive (loss) income, net of tax (7,679) (799) (9,808) 2,559
End of period (276) 31,892 (276) 31,892
Post-retirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 2,087 19,067 1,976 19,450
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 112 (383) 223 (766)
Total other comprehensive (loss) income, net of tax 112 (383) 223 (766)
End of period 2,199 18,684 2,199 18,684
Derivatives designated as cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 5,316 13,624 7,556 9,883
Other comprehensive income (loss) before reclassifications (5,788) 2,344 (5,240) 8,700
Amounts reclassified from accumulated other comprehensive income (2,003) (2,760) (4,791) (5,375)
Total other comprehensive (loss) income, net of tax (7,791) (416) (10,031) 3,325
End of period (2,475) 13,208 (2,475) 13,208
Tax (benefit) expense (2,000) 800 (1,800) 3,100
Reclassification from AOCI, current period, tax $ 700 $ 1,000 $ 1,700 $ 1,900