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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 466,577	$ 608,958	$ 482,603
Other comprehensive income, net of tax:
Change in unrealized gain (loss) on derivatives designated as cash flow hedges	27,983	13,665	(39,752)
Change in postretirement plan costs	10,373	2,565	4,941
Total other comprehensive (loss) income, net of tax	38,356	16,230	(34,811)
Comprehensive income	$ 504,933	$ 625,188	$ 447,792

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