CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 1,165,864	$ 1,085,814
Costs of revenue:
Direct costs	782,760	739,678
Indirect costs and selling expenses	264,757	261,244
Depreciation and amortization	18,747	17,588
Total costs of revenue	1,066,264	1,018,510
Income from operations	99,600	67,304
Interest expense and other, net	8,886	11,247
Income before income taxes	90,714	56,057
Income tax expense (benefit)	11,881	14,011
Net income	$ 78,833	$ 42,046
Basic earnings per share	$ 3.19	$ 1.72
Diluted earnings per share	$ 3.10	$ 1.67
Weighted-average basic shares outstanding	24,737	24,487
Weighted-average diluted shares outstanding	25,424	25,243