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Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income The following table shows the changes in accumulated other comprehensive loss, net of tax:
Three Months Ended
September 30, 2023		Six Months Ended
September 30, 2023
Post-retirement plansDerivatives designated as cash flow hedgesTotalsPost-retirement plansDerivatives designated as cash flow hedgesTotals
Beginning of period$19,067 $13,624 $32,691 $19,450 $9,883 $29,333 
Other comprehensive income before reclassifications(1)
— 2,344 2,344 — 8,700 8,700 
Amounts reclassified from accumulated other comprehensive income(383)(2,760)(3,143)(766)(5,375)(6,141)
Net current-period other comprehensive (loss) income(383)(416)(799)(766)3,325 2,559 
End of period$18,684 $13,208 $31,892 $18,684 $13,208 $31,892 
(1) Changes in other comprehensive income before reclassification for derivatives designated as cash flow hedges are recorded net of tax expense of $0.8 million and $3.1 million for the three and six months ended September 30, 2023, respectively. The tax impact of other comprehensive income before reclassification for post-retirement plans for the three and six months ended September 30, 2023 was immaterial.
Three Months Ended
September 30, 2022		Six Months Ended
September 30, 2022
Post-retirement plansDerivatives designated as cash flow hedgesTotalsPost-retirement plansDerivatives designated as cash flow hedgesTotals
Beginning of period$8,809 $5,533 $14,342 $8,811 $(226)$8,585 
Other comprehensive income before reclassifications(2)
— 7,514 7,514 (1)11,181 11,180 
Amounts reclassified from accumulated other comprehensive income (loss)(2)287 285 (3)2,379 2,376 
Net current-period other comprehensive (loss) income(2)7,801 7,799 (4)13,560 13,556 
End of period$8,807 $13,334 $22,141 $8,807 $13,334 $22,141 
(2) Changes in other comprehensive income before reclassification for derivatives designated as cash flow hedges are recorded net of tax expense of $2.7 million and $4.0 million for the three and six months ended September 30, 2022. The tax impact of other comprehensive income before reclassification for post-retirement plans for the three and six months ended September 30, 2022 was immaterial.