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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period $ 1,017,071 $ 1,099,124 $ 992,002 $ 1,046,721
Other comprehensive income before reclassifications 2,344 7,514 8,700 11,180
Amounts reclassified from accumulated other comprehensive income (loss) (3,143) 285 (6,141) 2,376
Total other comprehensive income, net of tax (799) 7,799 2,559 13,556
End of period 1,072,130 1,218,535 1,072,130 1,218,535
Totals        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 32,691 14,342 29,333 8,585
Total other comprehensive income, net of tax (799) 7,799 2,559 13,556
End of period 31,892 22,141 31,892 22,141
Post-retirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 19,067 8,809 19,450 8,811
Other comprehensive income before reclassifications 0 0 0 (1)
Amounts reclassified from accumulated other comprehensive income (loss) (383) (2) (766) (3)
Total other comprehensive income, net of tax (383) (2) (766) (4)
End of period 18,684 8,807 18,684 8,807
Derivatives designated as cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning of period 13,624 5,533 9,883 (226)
Other comprehensive income before reclassifications 2,344 7,514 8,700 11,181
Amounts reclassified from accumulated other comprehensive income (loss) (2,760) 287 (5,375) 2,379
Total other comprehensive income, net of tax (416) 7,801 3,325 13,560
End of period 13,208 13,334 13,208 13,334
Other comprehensive income (loss) before reclassifications, tax expense $ 800 $ 2,700 $ 3,100 $ 4,000