CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenues	$ 1,485,778	$ 1,468,711	$ 2,976,676	$ 2,928,217
Costs of revenues:
Direct costs	974,018	947,131	1,948,189	1,887,065
Indirect costs and selling expenses	354,977	347,807	712,083	702,811
Depreciation and amortization	32,676	32,234	65,268	62,378
Total costs of revenues	1,361,671	1,327,172	2,725,540	2,652,254
Income from operations	124,107	141,539	251,136	275,963
Interest expense and other, net	11,009	9,087	21,407	19,067
Income before income taxes	113,098	132,452	229,729	256,896
Income taxes	22,799	25,974	51,321	56,774
Net income	$ 90,299	$ 106,478	$ 178,408	$ 200,122
Basic earnings per share	$ 3.86	$ 4.22	$ 7.60	$ 7.95
Diluted earnings per share	$ 3.83	$ 4.18	$ 7.52	$ 7.86
Weighted-average basic shares outstanding	23,399	25,225	23,480	25,162
Weighted-average diluted shares outstanding	23,598	25,451	23,722	25,469