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Business Segments - Schedule of Summarized Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,351,002 | $ 2,166,982 | $ 6,858,722 | $ 6,323,680
Direct costs | 1,553,169 | 1,434,735 | 4,595,374 | 4,251,384
Indirect costs and selling expenses | 510,182 | 480,917 | 1,448,623 | 1,375,524
Depreciation and amortization | 58,774 | 54,961 | 167,104 | 139,264
Income from operations | 228,877 | 196,369 | 647,621 | 557,508
Capital expenditures | 26,818 | 16,240 | 59,876 | 37,640
Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,273,695 | 2,105,120 | 6,628,722 | 6,140,597
Domestic | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,273,695 | 2,105,120 | 6,628,722 | 6,140,597
Direct costs | 1,519,189 | 1,408,562 | 4,495,963 | 4,175,065
Indirect costs and selling expenses | 480,520 | 456,671 | 1,360,771 | 1,312,666
Depreciation and amortization | 57,279 | 54,017 | 162,910 | 136,321
Income from operations | 216,707 | 185,870 | 609,078 | 516,545
Capital expenditures | 25,307 | 16,113 | 55,031 | 36,443
International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 77,307 | 61,862 | 230,000 | 183,083
International | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 77,307 | 61,862 | 230,000 | 183,083
Direct costs | 33,980 | 26,173 | 99,411 | 76,319
Indirect costs and selling expenses | 29,662 | 24,246 | 87,852 | 62,858
Depreciation and amortization | 1,495 | 944 | 4,194 | 2,943
Income from operations | 12,170 | 10,499 | 38,543 | 40,963
Capital expenditures | $ 1,511 | $ 127 | $ 4,845 | $ 1,197

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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