CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Revenues	$ 2,166,982	$ 1,937,456	$ 6,323,680	$ 5,621,537
Costs of revenues:
Direct costs	1,434,735	1,290,903	4,251,384	3,819,072
Indirect costs and selling expenses	480,917	430,134	1,375,524	1,244,122
Depreciation and amortization	54,961	35,115	139,264	106,385
Total costs of revenues	1,970,613	1,756,152	5,766,172	5,169,579
Income from operations	196,369	181,304	557,508	451,958
Interest expense and other, net	45,117	27,668	113,153	80,758
Income before income taxes	151,252	153,636	444,355	371,200
Income taxes	39,392	38,286	102,380	85,933
Net income	$ 111,860	$ 115,350	$ 341,975	$ 285,267
Basic earnings per share (in dollars per share)	$ 5.02	$ 5.17	$ 15.31	$ 12.73
Diluted earnings per share (in dollars per share)	$ 5.00	$ 5.13	$ 15.21	$ 12.63
Weighted-average basic shares outstanding (in shares)	22,279	22,292	22,332	22,407
Weighted-average diluted shares outstanding (in shares)	22,383	22,478	22,485	22,593