CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 1,465,600	$ 1,264,958	$ 4,224,461	$ 3,612,463
Costs of revenue:
Direct costs	953,630	824,024	2,737,378	2,397,633
Indirect costs and selling expenses	371,135	324,828	1,081,175	859,262
Depreciation and amortization	27,159	21,198	81,888	58,797
Total costs of revenue	1,351,924	1,170,050	3,900,441	3,315,692
Income from operations	113,676	94,908	324,020	296,771
Interest expense and other, net	14,087	13,466	45,612	31,773
Income before income taxes	99,589	81,442	278,408	264,998
Income tax expense	19,012	13,297	50,659	49,424
Net income	$ 80,577	$ 68,145	$ 227,749	$ 215,574
Basic earnings per share	$ 3.21	$ 2.74	$ 9.11	$ 8.69
Diluted earnings per share	$ 3.16	$ 2.69	$ 8.94	$ 8.50
Weighted-average basic shares outstanding	25,078	24,866	25,012	24,819
Weighted-average diluted shares outstanding	25,478	25,348	25,481	25,369