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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 186,950	$ 145,644	$ 742,295	$ 477,750
Other comprehensive income, net of tax:
Change in unrealized gain (loss) on derivatives designated as cash flow hedges	3,300	(6,006)	(6,731)	(2,681)
Change in postretirement plan costs	111	(383)	334	(1,149)
Total other comprehensive income (loss), net of tax	3,411	(6,389)	(6,397)	(3,830)
Comprehensive income attributable to common stockholders	$ 190,361	$ 139,255	$ 735,898	$ 473,920

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