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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 170,718 $ 170,781 $ 332,106 $ 308,874
Other comprehensive income, net of tax:        
Change in unrealized gain on derivatives designated as cash flow hedges (416) 7,801 3,325 13,560
Change in postretirement plan costs (383) (2) (766) (4)
Total other comprehensive income, net of tax (799) 7,799 2,559 13,556
Comprehensive income 169,919 178,580 334,665 322,430
Comprehensive loss attributable to non-controlling interest 0 151 0 342
Comprehensive income attributable to common stockholders $ 169,919 $ 178,731 $ 334,665 $ 322,772