CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenues	$ 1,937,456	$ 1,744,270	$ 5,621,537	$ 4,999,445
Costs of revenues:
Direct costs	1,290,903	1,143,781	3,819,072	3,293,867
Indirect costs and selling expenses	430,134	410,235	1,244,122	1,180,619
Depreciation and amortization	35,115	35,220	106,385	106,255
Total costs of revenues	1,756,152	1,589,236	5,169,579	4,580,741
Income from operations	181,304	155,034	451,958	418,704
Interest expense and other, net	27,668	23,570	80,758	59,705
Income before income taxes	153,636	131,464	371,200	358,999
Income taxes	38,286	30,722	85,933	82,031
Net income	$ 115,350	$ 100,742	$ 285,267	$ 276,968
Basic earnings per share (in dollars per shares)	$ 5.17	$ 4.37	$ 12.73	$ 11.87
Diluted earnings per share (in dollars per shares)	$ 5.13	$ 4.33	$ 12.63	$ 11.76
Weighted-average basic shares outstanding (in shares)	22,292	23,055	22,407	23,329
Weighted-average diluted shares outstanding (in shares)	22,478	23,277	22,593	23,546