Income Taxes (Tables)

12 Months Ended

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