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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of year	$ 1,046,070
Other comprehensive income before reclassifications	21,665	$ 25,326	$ 952
Amounts reclassified from accumulated other comprehensive income	(917)	13,030	15,278
Total other comprehensive income, net of tax	20,748	38,356	16,230
End of year	992,002	1,046,070
Post-retirement plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of year	8,811	(1,562)	(4,127)
Other comprehensive income before reclassifications	10,644	10,294	2,481
Amounts reclassified from accumulated other comprehensive income	(5)	79	84
Total other comprehensive income, net of tax	10,639	10,373	2,565
End of year	19,450	8,811	(1,562)
Tax benefit	3,800	3,600	900
Derivatives designated as cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of year	(226)	(28,209)	(41,874)
Other comprehensive income before reclassifications	11,021	15,032	(1,529)
Amounts reclassified from accumulated other comprehensive income	(912)	12,951	15,194
Total other comprehensive income, net of tax	10,109	27,983	13,665
End of year	9,883	(226)	(28,209)
Tax benefit	3,900	5,300	500
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of year	8,585	(29,771)	(46,001)
End of year	$ 29,333	$ 8,585	$ (29,771)

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