CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenues	$ 1,833,934	$ 1,649,416	$ 3,684,081	$ 3,255,175
Costs of revenues:
Direct costs	1,255,251	1,094,314	2,528,169	2,150,086
Indirect costs and selling expenses	409,355	388,303	813,988	770,384
Depreciation and amortization	36,023	35,932	71,270	71,035
Total costs of revenues	1,700,629	1,518,549	3,413,427	2,991,505
Income from operations	133,305	130,867	270,654	263,670
Interest expense and other, net	27,519	19,942	53,090	36,135
Income before income taxes	105,786	110,925	217,564	227,535
Income taxes	21,916	23,824	47,647	51,309
Net income	$ 83,870	$ 87,101	$ 169,917	$ 176,226
Basic earnings per share (in dollars per shares)	$ 3.76	$ 3.71	$ 7.56	$ 7.51
Diluted earnings per share (in dollars per shares)	$ 3.74	$ 3.68	$ 7.50	$ 7.44
Weighted-average basic shares outstanding (in shares)	22,282	23,506	22,464	23,463
Weighted-average diluted shares outstanding (in shares)	22,407	23,676	22,650	23,677