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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]      
Revenue $ 8,363,700 $ 7,858,938 $ 7,463,841
Operating costs and expenses:      
Cost of revenue 3,899,622 3,657,530 3,379,180
Billable expenses 2,474,163 2,325,888 2,298,413
General and administrative expenses 1,158,987 1,036,834 1,035,965
Depreciation and amortization 145,747 84,315 81,081
Total operating costs and expenses 7,678,519 7,104,567 6,794,639
Operating income 685,181 754,371 669,202
Interest expense (92,352) (81,270) (96,960)
Other income (expense), net 11,214 (10,662) 7,192
Income before income taxes 604,043 662,439 579,434
Income tax expense 137,466 53,481 96,831
Net income 466,577 608,958 482,603
Net loss attributable to non-controlling interest (163) 0 0
Net income attributable to common stockholders $ 466,740 $ 608,958 $ 482,603
Earnings per share of common stock (Note 4):      
Basic (in dollars per share) $ 3.46 $ 4.40 $ 3.43
Diluted (in dollars per share) $ 3.44 $ 4.37 $ 3.41