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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]        
Revenue $ 1,663,112 $ 1,470,709 $ 4,923,957 $ 4,536,524
Operating costs and expenses:        
Cost of revenue 750,680 678,574 2,285,062 2,111,058
Billable expenses 510,047 443,015 1,465,831 1,378,235
General and administrative expenses 222,673 203,946 655,410 611,008
Depreciation and amortization 17,780 16,701 50,359 48,196
Total operating costs and expenses 1,501,180 1,342,236 4,456,662 4,148,497
Operating income 161,932 128,473 467,295 388,027
Interest expense (22,036) (20,604) (67,357) (60,309)
Other income (expense), net 373 (1,370) (2,415) (3,849)
Income before income taxes 140,269 106,499 397,523 323,869
Income tax expense 8,232 31,572 68,569 104,683
Net income $ 132,037 $ 74,927 $ 328,954 $ 219,186
Earnings per common share (Note 4):        
Basic (in dollars per share) $ 0.92 $ 0.51 $ 2.29 $ 1.48
Diluted (in dollars per share) $ 0.92 $ 0.51 $ 2.27 $ 1.46