CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 4,467,860	$ 4,354,617	$ 3,744,053
Costs of revenue:
Direct costs	2,978,608	2,934,804	2,487,633
Indirect costs and selling expenses	1,076,356	1,050,792	926,918
Depreciation and amortization	72,196	71,760	64,752
Total costs of revenue	4,127,160	4,057,356	3,479,303
Income from operations	340,700	297,261	264,750
Interest expense and other, net	42,036	48,642	41,138
Income before income taxes	298,664	248,619	223,612
Income tax (benefit) expense	(2,507)	84,948	80,813
Net income	$ 301,171	$ 163,671	$ 142,799
Basic earnings per share	$ 12.23	$ 6.71	$ 5.89
Diluted earnings per share	$ 11.93	$ 6.53	$ 5.76
Weighted-average basic shares outstanding	24,616	24,401	24,262
Weighted-average diluted shares outstanding	25,255	25,069	24,802