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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 271,215	$ 466,577	$ 608,958
Other comprehensive income, net of tax:
Change in unrealized gain on derivatives designated as cash flow hedges	10,109	27,983	13,665
Change in postretirement plan costs	10,639	10,373	2,565
Total other comprehensive income, net of tax	20,748	38,356	16,230
Comprehensive income	291,963	504,933	625,188
Comprehensive loss attributable to non-controlling interest	576	163	0
Comprehensive income attributable to common stockholders	$ 292,539	$ 505,096	$ 625,188

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