Nature of Operations and Summary of Significant Accounting Policies (Policies)	9 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]
Consolidation	The condensed consolidated financial statements include the accounts of JKHY and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated.
Allowance for Credit Losses	The Company monitors trade and other receivable balances and contract assets and estimates the allowance for lifetime expected credit losses. Estimates of expected credit losses are based on historical collection experience and other factors, including those related to current market conditions and events.
Property, Plant and Equipment	Property and equipment is recorded at cost and depreciated using the straight-line method over the estimated useful lives of the assets.
Intangible Assets	Intangible assets consist of goodwill, customer relationships, computer software, and trade names acquired in business acquisitions in addition to internally developed computer software. The amounts are amortized, with the exception of those intangible assets with an indefinite life (such as goodwill), over an estimated economic benefit period, generally three to twenty years.
Common Stock	The Board of Directors has authorized the Company to repurchase shares of its common stock. Under this authorization, the Company may finance its share repurchases with available cash reserves or borrowings on its existing line-of-credit. The share repurchase program does not include specific price targets or timetables and may be suspended at any time.
Income Tax, Policy	Deferred tax liabilities and assets are recognized for the tax effects of differences between the financial statement basis and tax basis of assets and liabilities. A valuation allowance would be established to reduce deferred tax assets if it is more likely than not that a deferred tax asset will not be realized. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based upon the technical merits of the position. The tax benefit recognized in the financial statements from such a position is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. Also, interest and penalties expense are recognized on the full amount of unrecognized benefits for uncertain tax positions. The Company's policy is to include interest and penalties related to unrecognized tax benefits in income tax expense.

Nature of Operations and Summary of Significant Accounting Policies (Policies)

9 Months Ended

Mar. 31, 2022

The condensed consolidated financial statements include the accounts of JKHY and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated.

Allowance for Credit Losses

The Company monitors trade and other receivable balances and contract assets and estimates the allowance for lifetime expected credit losses. Estimates of expected credit losses are based on historical collection experience and other factors, including those related to current market conditions and events.

Property, Plant and Equipment

Property and equipment is recorded at cost and depreciated using the straight-line method over the estimated useful lives of the assets.

Intangible Assets

Intangible assets consist of goodwill, customer relationships, computer software, and trade names acquired in business acquisitions in addition to internally developed computer software. The amounts are amortized, with the exception of those intangible assets with an indefinite life (such as goodwill), over an estimated economic benefit period, generally three to twenty years.

Common Stock

The Board of Directors has authorized the Company to repurchase shares of its common stock. Under this authorization, the Company may finance its share repurchases with available cash reserves or borrowings on its existing line-of-credit. The share repurchase program does not include specific price targets or timetables and may be suspended at any time.

Income Tax, Policy

Deferred tax liabilities and assets are recognized for the tax effects of differences between the financial statement basis and tax basis of assets and liabilities. A valuation allowance would be established to reduce deferred tax assets if it is more likely than not that a deferred tax asset will not be realized.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based upon the technical merits of the position. The tax benefit recognized in the financial statements from such a position is measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. Also, interest and penalties expense are recognized on the full amount of unrecognized benefits for uncertain tax positions. The Company's policy is to include interest and penalties related to unrecognized tax benefits in income tax expense.

- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

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