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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]    
Revenue $ 1,956,453 $ 1,825,176
Operating costs and expenses:    
Cost of revenue 948,902 840,654
Billable expenses 549,077 551,175
General and administrative expenses 245,855 234,280
Depreciation and amortization 20,732 20,021
Total operating costs and expenses 1,764,566 1,646,130
Operating income 191,887 179,046
Interest expense (20,235) (25,187)
Other (expense) income, net (836) 1,971
Income before income taxes 170,816 155,830
Income tax expense 41,487 38,444
Net income $ 129,329 $ 117,386
Earnings per common share (Note 4):    
Basic (in dollars per share) $ 0.93 $ 0.83
Diluted (in dollars per share) $ 0.92 $ 0.83