CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenues	$ 1,744,270	$ 1,583,980	$ 4,999,445	$ 4,560,656
Costs of revenues:
Direct costs	1,143,781	1,022,181	3,293,867	2,970,370
Indirect costs and selling expenses	410,235	402,227	1,180,619	1,114,310
Depreciation and amortization	35,220	34,216	106,255	99,484
Total costs of revenues	1,589,236	1,458,624	4,580,741	4,184,164
Income from operations	155,034	125,356	418,704	376,492
Interest expense and other, net	23,570	9,084	59,705	30,491
Income before income taxes	131,464	116,272	358,999	346,001
Income taxes	30,722	20,855	82,031	72,176
Net income	$ 100,742	$ 95,417	$ 276,968	$ 273,825
Basic earnings per share (dollars per share)	$ 4.37	$ 4.08	$ 11.87	$ 11.67
Diluted earnings per share (dollars per share)	$ 4.33	$ 4.04	$ 11.76	$ 11.56
Weighted-average basic shares outstanding (in shares)	23,055	23,409	23,329	23,457
Weighted-average diluted shares outstanding (in shares)	23,277	23,616	23,546	23,687