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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 145,644 $ 30,689 $ 477,750 $ 339,563
Other comprehensive income, net of tax:        
Change in unrealized gain (loss) on derivatives designated as cash flow hedges (6,006) (62) (2,681) 13,498
Change in postretirement plan costs (383) 0 (1,149) (4)
Total other comprehensive income (loss), net of tax (6,389) (62) (3,830) 13,494
Comprehensive income 139,255 30,627 473,920 353,057
Comprehensive loss attributable to non-controlling interest 0 308 0 650
Comprehensive income attributable to common stockholders $ 139,255 $ 30,935 $ 473,920 $ 353,707