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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Income Statement [Abstract]      
Revenue $ 11,980 $ 10,662 $ 9,259
Operating costs and expenses:      
Cost of revenue 5,419 4,921 4,305
Billable expenses 3,780 3,282 2,809
General and administrative expenses 1,246 1,281 1,533
Depreciation and amortization 165 164 165
Total operating costs and expenses 10,610 9,648 8,812
Operating income 1,370 1,014 447
Interest expense, net (168) (147) (110)
Other income (expense), net 17 (13) 31
Income before income taxes 1,219 854 368
Income tax expense 284 248 97
Net income 935 606 271
Net loss attributable to non-controlling interest 0 0 1
Net income attributable to common stockholders $ 935 $ 606 $ 272
Earnings per share of common stock (Note 4):      
Basic (in dollars per share) $ 7.28 $ 4.61 $ 2.04
Diluted (in dollars per share) $ 7.25 $ 4.59 $ 2.03