Business Segments - Summarized Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 6,702,546	$ 6,202,917	$ 6,044,135
Net income	384,735	366,794	457,443
Net assets	3,224,334	3,053,543	2,665,278	$ 2,661,310
Goodwill	4,084,705	4,058,291	3,632,578
Total long-term assets	5,390,771	5,419,793	4,841,196
Total assets	6,600,808	6,629,431	6,172,372
Capital expenditures	63,717	74,564	73,129
Depreciation and amortization	141,564	134,681	125,363
Domestic Operations
Segment Reporting Information [Line Items]
Revenues	6,512,938	6,011,059	5,868,392
Net income	354,937	339,381	432,912
Net assets	2,998,986	2,867,396	2,461,048
Goodwill	3,940,064	3,934,625	3,491,747
Total long-term assets	5,219,175	5,271,444	4,665,782
Total assets	6,305,758	6,380,745	5,898,869
Capital expenditures	61,201	72,736	69,610
Depreciation and amortization	138,879	131,401	121,725
International Operations
Segment Reporting Information [Line Items]
Revenues	189,608	191,858	175,743
Net income	29,798	27,413	24,531
Net assets	225,348	186,147	204,230
Goodwill	144,641	123,666	140,831
Total long-term assets	171,596	148,349	175,414
Total assets	295,050	248,686	273,503
Capital expenditures	2,516	1,828	3,519
Depreciation and amortization	$ 2,685	$ 3,280	$ 3,638