CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 6,044,135	$ 5,720,042	$ 4,986,341
Costs of revenue:
Direct costs	3,930,707	3,719,056	3,304,053
Indirect costs and selling expenses	1,448,614	1,432,602	1,218,544
Depreciation and amortization	125,363	110,688	85,877
Total costs of revenue	5,504,684	5,262,346	4,608,474
Income from operations	539,451	457,696	377,867
Interest expense and other, net	39,836	56,059	49,958
Income before income taxes	499,615	401,637	327,909
Income taxes	42,172	80,157	62,305
Net income	$ 457,443	$ 321,480	$ 265,604
Basic earnings per share	$ 18.52	$ 12.84	$ 10.70
Diluted earnings per share	$ 18.30	$ 12.61	$ 10.46
Weighted-average basic shares outstanding	24,705	25,031	24,833
Weighted-average diluted shares outstanding	24,992	25,485	25,395