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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Revenue $ 2,890 $ 3,146 $ 5,814 $ 6,088
Operating costs and expenses:        
Cost of revenue 1,340 1,362 2,763 2,734
Billable expenses 918 968 1,799 1,913
General and administrative expenses 308 225 631 554
Depreciation and amortization 41 42 81 83
Total operating costs and expenses 2,607 2,597 5,274 5,284
Operating income 283 549 540 804
Interest expense, net (48) (46) (92) (84)
Other (expense) income (2) 10 1 7
Income before income taxes 233 513 449 727
Income tax expense 58 123 3 172
Net income $ 175 $ 390 $ 446 $ 555
Earnings per share of common stock (Note 4):        
Basic (in dollars per share) $ 1.42 $ 3.02 $ 3.59 $ 4.29
Diluted (in dollars per share) $ 1.42 $ 3.01 $ 3.58 $ 4.27