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Income Taxes (Tables) | 12 Months Ended
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Jun. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Income Tax From Continuing Operations Provision for Income Tax Components Disclosure | Earnings before income taxes shown below are based on the geographic location to which such earnings are attributable.
Years ended June 30, |  | 2025 |  | 2024 |  | 2023
Earnings before income taxes: |  |  |  |  |  |
United States |  | $ | 4,825.6 |  |  | $ | 4,408.0 |  |  | $ | 4,091.4 |
Foreign |  | 484.5 |  |  | 464.3 |  |  | 346.2 |
|  | $ | 5,310.1 |  |  | $ | 4,872.3 |  |  | $ | 4,437.6 |
Schedule of Components of Provision (Benefit) for Income Taxes | The provision (benefit) for income taxes consists of the following components:
Years ended June 30, |  | 2025 |  | 2024 |  | 2023
Current: |  |  |  |  |  |
Federal |  | $ | 880.5 |  |  | $ | 847.4 |  |  | $ | 840.0 |
Foreign |  | 136.0 |  |  | 132.8 |  |  | 104.6 |
State |  | 176.9 |  |  | 177.5 |  |  | 161.1 |
Total current |  | 1,193.4 |  |  | 1,157.7 |  |  | 1,105.7 |
Deferred: |  |  |  |  |  |
Federal |  | 0.7 |  |  | (18.7) |  |  | (77.4) |
Foreign |  | 19.4 |  |  | (6.6) |  |  | 4.3 |
State |  | 16.9 |  |  | (12.1) |  |  | (7.0) |
Total deferred |  | 37.0 |  |  | (37.4) |  |  | (80.1) |
Total provision for income taxes |  | $ | 1,230.4 |  |  | $ | 1,120.3 |  |  | $ | 1,025.6 |
Schedule of Reconciliation Between Federal Statutory Tax and Effective Tax Rate | A reconciliation between the Company's effective tax rate and the U.S. federal statutory rate is as follows:
Years ended June 30, |  | 2025 |  | % |  | 2024 |  | % |  | 2023 |  | %
Provision for taxes at U.S. statutory rate |  | $ | 1,115.1 |  |  | 21.0 |  |  | $ | 1,023.2 |  |  | 21.0 |  |  | $ | 931.9 |  |  | 21.0 |
Increase/(decrease) in provision from: |  |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal tax benefit |  | 128.0 |  |  | 2.4 |  |  | 120.6 |  |  | 2.5 |  |  | 111.2 |  |  | 2.5 |
Foreign rate differential |  | 39.0 |  |  | 0.7 |  |  | 41.0 |  |  | 0.9 |  |  | 33.1 |  |  | 0.7 |
Excess tax benefit - Stock-based compensation |  | (24.3) |  |  | (0.4) |  |  | (17.1) |  |  | (0.4) |  |  | (19.0) |  |  | (0.4) |
Other |  | (27.4) |  |  | (0.5) |  |  | (47.4) |  |  | (1.0) |  |  | (31.6) |  |  | (0.7) |
|  | $ | 1,230.4 |  |  | 23.2 |  |  | $ | 1,120.3 |  |  | 23.0 |  |  | $ | 1,025.6 |  |  | 23.1 |
Summary of Deferred Tax Assets and Liabilities | The significant components of deferred income tax assets and liabilities and their balance sheet classifications are as follows:
Years ended June 30, |  | 2025 |  | 2024
Deferred tax assets: |  |  |  |
Accrued expenses not currently deductible |  | $ | 256.7 |  |  | $ | 237.4 |
Stock-based compensation expense |  | 56.0 |  |  | 51.3 |
Foreign tax credits |  | 8.8 |  |  | 12.0 |
Fixed and intangible assets |  | 216.8 |  |  | 194.9 |
Net operating losses |  | 59.3 |  |  | 41.7 |
Disallowed business interest expense carryforward |  | 30.9 |  |  | — |
Unrealized investment losses, net |  | 98.4 |  |  | 351.4 |
Other |  | 28.5 |  |  | 39.1 |
|  | 755.4 |  |  | 927.8 |
Less: valuation allowances |  | (23.8) |  |  | (11.1) |
Deferred tax assets, net |  | $ | 731.6 |  |  | $ | 916.7 |
Deferred tax liabilities: |  |  |  |
Deferred contract costs |  | $ | 654.0 |  |  | $ | 620.7 |
Prepaid expenses |  | 103.1 |  |  | 88.8 |
Prepaid retirement benefits |  | 53.1 |  |  | 40.3 |
Tax on unrepatriated earnings |  | 12.0 |  |  | 10.2 |
Other |  | 16.9 |  |  | 20.8 |
Deferred tax liabilities |  | 839.1 |  |  | 780.8 |
Net deferred tax (liabilities)/assets |  | $ | (107.5) |  |  | $ | 135.9 |
Summary of Reconciliation of the Beginning and Ending Amounts of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows:
|  | 2025 |  | 2024 |  | 2023
Unrecognized tax benefits at beginning of the year |  | $ | 126.9 |  |  | $ | 116.9 |  |  | $ | 98.1 |
Additions for tax positions |  | 29.5 |  |  | 17.2 |  |  | 11.3 |
Additions for tax positions of prior periods |  | 26.7 |  |  | 17.8 |  |  | 16.8 |
Reductions for tax positions of prior periods |  | (1.8) |  |  | (12.8) |  |  | (5.0) |
Settlement with tax authorities |  | (0.1) |  |  | (9.0) |  |  | (1.8) |
Expiration of the statute of limitations |  | (17.5) |  |  | (2.9) |  |  | (1.0) |
Impact of foreign exchange rate fluctuations |  | (0.7) |  |  | (0.3) |  |  | (1.5) |
Unrecognized tax benefit at end of year |  | $ | 163.0 |  |  | $ | 126.9 |  |  | $ | 116.9 |
Summary of Income Tax Examinations | Examinations in progress in which the Company has significant business operations are as follows:
Taxing Jurisdiction |  | Fiscal Years under Examination |
U.S. (IRS) |  | 2023 - 2025 |
Arizona |  | 2016 - 2020 |
Massachusetts |  | 2016 - 2022 |
Michigan |  | 2020 - 2023 |
New Jersey |  | 2020 - 2022 |
New York City |  | 2016 - 2021 |
New York State |  | 2019 - 2021 |
India |  | 2014 - 2022 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of income tax examinations that an enterprise is currently subject to or that have been completed in the current period typically including a description of the examination, the jurisdiction conducting the examination, the tax year(s) under examination, the likelihood of an unfavorable settlement, the range of possible losses, the liability recorded, the increase or decrease in the liability from the prior period, and any penalties and interest that have been recorded. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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