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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Statement [Abstract]        
Revenue $ 3,146,386 $ 2,666,282 $ 6,088,183 $ 5,320,768
Operating costs and expenses:        
Cost of revenue 1,362,282 1,232,712 2,733,516 2,484,628
Billable expenses 968,022 824,788 1,913,003 1,637,092
General and administrative expenses 225,417 300,886 554,706 614,887
Depreciation and amortization 42,056 40,907 83,185 82,754
Total operating costs and expenses 2,597,777 2,399,293 5,284,410 4,819,361
Operating income 548,609 266,989 803,773 501,407
Interest expense (47,045) (44,756) (92,976) (80,230)
Other income, net 11,788 3,556 16,916 5,480
Income before income taxes 513,352 225,789 727,713 426,657
Income tax expense 123,240 55,071 172,368 94,551
Net income $ 390,112 $ 170,718 $ 555,345 $ 332,106
Earnings per common share (Note 4):        
Basic (in dollars per share) $ 3.02 $ 1.29 $ 4.29 $ 2.52
Diluted (in dollars per share) $ 3.01 $ 1.29 $ 4.27 $ 2.51