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v3.26.1

Corporate Investments and Funds Held for Clients - Narrative (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Jun. 30, 2025
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | $ 37,043,600,000 | $ 33,777,700,000
Client fund obligation repayment period | 1 year |
Client funds obligations | $ 46,774,500,000 | 31,343,300,000
Client funds held in grantor trust | $ 40,731,900,000 | $ 27,355,200,000
Client funds investments with original maturities | 90 days |
Fair Value, Inputs, Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | $ 0 |
Fair Value, Inputs, Level 3 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 0 |
Asset-Backed Auto Loan Receivables |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 913,100,000 |
Fixed Rate Credit Card |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 742,400,000 |
Asset-Backed Securities, Device Payment Plan Agreement Receivables |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 341,600,000 |
Federal Farm Credit Banks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 657,200,000 |
Federal Home Loan Banks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 136,000,000.0 |
Debt Security, Corporate, Non-US |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 731,500,000 |
Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 529,100,000 |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 347,400,000 |
Supranational Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | $ 231,800,000 |

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