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Accumulated Other Comprehensive Income / (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period $ 1,200,769 $ 1,072,130 $ 1,046,562 $ 992,002
Other comprehensive income (loss) before reclassifications 4,667 (3,165) (573) 5,535
Amounts reclassified from accumulated other comprehensive income (loss) (1,256) (3,224) (5,824) (9,365)
Total other comprehensive income (loss), net of tax 3,411 (6,389) (6,397) (3,830)
End of period 1,209,917 1,086,243 1,209,917 1,086,243
Totals        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period (276) 31,892 9,532 29,333
Total other comprehensive income (loss), net of tax 3,411 (6,389) (6,397) (3,830)
End of period 3,135 25,503 3,135 25,503
Post-retirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 2,199 18,684 1,976 19,450
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 111 (383) 334 (1,149)
Total other comprehensive income (loss), net of tax 111 (383) 334 (1,149)
End of period 2,310 18,301 2,310 18,301
Derivatives designated as cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period (2,475) 13,208 7,556 9,883
Other comprehensive income (loss) before reclassifications 4,667 (3,165) (573) 5,535
Amounts reclassified from accumulated other comprehensive income (loss) (1,367) (2,841) (6,158) (8,216)
Total other comprehensive income (loss), net of tax 3,300 (6,006) (6,731) (2,681)
End of period 825 7,202 825 7,202
Tax (benefit) expense (1,600) 1,100 200 (2,000)
Reclassification from AOCI, current period, tax $ (500) $ (1,000) $ (2,100) $ (2,900)