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Accumulated Other Comprehensive Income
 9 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income
All amounts recorded in other comprehensive income are related to the Company's post-retirement plans and interest rate swaps designated as cash flow hedges. The following table shows the changes in accumulated other comprehensive loss, net of tax:
Three Months Ended
December 31, 2023		Nine Months Ended
December 31, 2023
Post-retirement plansDerivatives designated as cash flow hedgesTotalsPost-retirement plansDerivatives designated as cash flow hedgesTotals
Beginning of period$18,684 $13,208 $31,892 $19,450 $9,883 $29,333 
Other comprehensive income (loss) before reclassifications(1)
— (3,165)(3,165)— 5,535 5,535 
Amounts reclassified from accumulated other comprehensive income(383)(2,841)(3,224)(1,149)(8,216)(9,365)
Net current-period other comprehensive loss(383)(6,006)(6,389)(1,149)(2,681)(3,830)
End of period$18,301 $7,202 $25,503 $18,301 $7,202 $25,503 
(1) Changes in other comprehensive income before reclassification for derivatives designated as cash flow hedges are recorded net of tax benefit (expense) of $1.1 million and $(2.0) million for the three and nine months ended December 31, 2023, respectively. The tax impact of other comprehensive income before reclassification for post-retirement plans for the three and nine months ended December 31, 2023 was immaterial.
Three Months Ended
December 31, 2022		Nine Months Ended
December 31, 2022
Post-retirement plansDerivatives designated as cash flow hedgesTotalsPost-retirement plansDerivatives designated as cash flow hedgesTotals
Beginning of period$8,807 $13,334 $22,141 $8,811 $(226)$8,585 
Other comprehensive income before reclassifications(2)
2 1,155 1,157 — 12,337 12,337 
Amounts reclassified from accumulated other comprehensive income (loss)(2)(1,217)(1,219)(4)1,161 1,157 
Net current-period other comprehensive (loss) income— (62)(62)(4)13,498 13,494 
End of period$8,807 $13,272 $22,079 $8,807 $13,272 $22,079 
(2) Changes in other comprehensive income before reclassification for derivatives designated as cash flow hedges are recorded net of tax expense of $0.4 million and $4.4 million for the three and nine months ended December 31, 2022. The tax impact of other comprehensive income before reclassification for post-retirement plans for the three and nine months ended December 31, 2022 was immaterial.