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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 390,112	$ 170,718	$ 555,345	$ 332,106
Other comprehensive income, net of tax:
Change in unrealized (loss) gain on derivatives designated as cash flow hedges	(7,791)	(416)	(10,031)	3,325
Change in postretirement plan costs	112	(383)	223	(766)
Total other comprehensive (loss) income, net of tax	(7,679)	(799)	(9,808)	2,559
Comprehensive income attributable to common stockholders	$ 382,433	$ 169,919	$ 545,537	$ 334,665

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