CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 5,720,042	$ 4,986,341	$ 4,467,860
Costs of revenue:
Direct costs	3,719,056	3,304,053	2,978,608
Indirect costs and selling expenses	1,432,602	1,218,544	1,076,356
Depreciation and amortization	110,688	85,877	72,196
Total costs of revenue	5,262,346	4,608,474	4,127,160
Income from operations	457,696	377,867	340,700
Interest expense and other, net	56,059	49,958	42,036
Income before income taxes	401,637	327,909	298,664
Income tax expense (benefit)	80,157	62,305	(2,507)
Net income	$ 321,480	$ 265,604	$ 301,171
Basic earnings per share	$ 12.84	$ 10.70	$ 12.23
Diluted earnings per share	$ 12.61	$ 10.46	$ 11.93
Weighted-average basic shares outstanding	25,031	24,833	24,616
Weighted-average diluted shares outstanding	25,485	25,395	25,255