CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 1,395,469	$ 1,181,641	$ 2,758,861	$ 2,347,505
Costs of revenue:
Direct costs	904,867	790,849	1,783,748	1,573,609
Indirect costs and selling expenses	352,448	269,677	710,040	534,434
Depreciation and amortization	27,967	18,852	54,729	37,599
Total costs of revenue	1,285,282	1,079,378	2,548,517	2,145,642
Income from operations	110,187	102,263	210,344	201,863
Interest expense and other, net	14,714	9,421	31,525	18,307
Income before income taxes	95,473	92,842	178,819	183,556
Income tax expense	16,278	24,246	31,647	36,127
Net income	$ 79,195	$ 68,596	$ 147,172	$ 147,429
Basic earnings per share	$ 3.16	$ 2.76	$ 5.89	$ 5.95
Diluted earnings per share	$ 3.11	$ 2.71	$ 5.78	$ 5.81
Weighted-average basic shares outstanding	25,065	24,856	24,979	24,796
Weighted-average diluted shares outstanding	25,435	25,338	25,483	25,381