Nature of Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]
Consolidation	The consolidated financial statements include the accounts of JKHY and all of its subsidiaries, which are wholly owned, and all intercompany accounts and transactions have been eliminated.
Use of Estimates	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Risks and Uncertainties The novel coronavirus ("COVID-19") pandemic adversely impacted global economic activity and contributed to significant volatility in financial markets during 2020 and in 2021 year to date. The extent to which the COVID-19 pandemic will directly or indirectly impact our business and financial results, including revenue, expenses, cost of revenues, research and development, and selling, general and administrative expenses, will depend on future developments that are highly uncertain, such as new information that may emerge concerning COVID-19 and the actions taken to contain or treat COVID-19 (including the efficacy and distribution of vaccines), as well as the economic impact on local, regional, national and international customers and markets. The Company assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to the Company and the unknown future impacts of COVID-19 as of and for its fiscal year ended June 30, 2021 and through the date of this report. The accounting matters assessed included, but were not limited to, the Company’s allowance for credit losses, as well as the carrying value of goodwill and other long-lived assets. While there was not a material impact to the Company’s consolidated financial statements, the Company’s future assessment of the magnitude and duration of COVID-19, as well as other factors, could result in material impacts to the Company’s consolidated financial statements in future reporting periods.
Revenue Recognition	The Company generates "Services and Support" revenue through software licensing and related services, private cloud core and complementary software solutions, professional services, and hardware sales. The Company generates "Processing" revenue through processing of remittance transactions, card transactions and monthly fees, and digital transactions. Significant Judgments in Application of the Guidance Identification of Performance Obligations The Company enters into contracts with customers that may include multiple types of goods and services. At contract inception, the Company assesses the solutions and services promised in its contracts with customers and identifies a performance obligation for each promise to transfer to the customer a solution or service (or bundle of solutions or services) that is distinct - that is, if the solution or service is separately identifiable from other items in the arrangement and if the customer can benefit from the solution or service on its own or together with other resources that are readily available. Significant judgment is used in the identification and accounting for all performance obligations. Determination of Transaction Price The amount of revenue recognized is based on the consideration the Company expects to receive in exchange for transferring goods and services to the customer. The Company’s contracts with its customers frequently contain some component of variable consideration. The Company estimates variable consideration in its contracts primarily using the expected value method, based on both historical and current information. Where appropriate, the Company may constrain the estimated variable consideration included in the transaction price in the event of a high degree of uncertainty as to the final consideration amount. Significant judgment is used in the estimate of variable consideration of customer contracts that are long-term and include uncertain transactional volumes. Technology or service components from third parties are frequently included in or combined with the Company’s applications or service offerings. Whether the Company recognizes revenue based on the gross amount billed to the customer or the net amount retained involves judgment in determining whether the Company controls the good or service before it is transferred to the customer. This assessment is made at the performance obligation level. Allocation of Transaction Price The transaction price, once determined, is allocated between the various performance obligations in the contract based upon their relative standalone selling prices. The standalone selling prices are determined based on the prices at which the Company separately sells each good or service. For items that are not sold separately, the Company estimates the standalone selling prices using all information that is reasonably available, including reference to historical pricing data.
Computer Software Development	The Company capitalizes new product development costs incurred for software to be sold from the point at which technological feasibility has been established through the point at which the product is ready for general availability. Software development costs that are capitalized are evaluated on a product-by-product basis annually for impairment and are assigned an estimated economic life based on the type of product, market characteristics, and maturity of the market for that particular product. These costs are amortized based on current and estimated future revenue from the product or on a straight-line basis, whichever yields greater amortization expense. All of this amortization expense is included within components of operating income, primarily cost of revenue.
Internal Use Software	The Company capitalizes development costs for internal use software beginning at the start of application development. Amortization begins on the date the software is placed in service and the amortization period is based on estimated useful life.
Cash Equivalents	The Company considers all highly liquid investments with maturities of three months or less at the time of acquisition to be cash equivalents.
Accounts Receivable	Receivables are recorded at the time of billing. On July 1, 2020, the Company adopted FASB Accounting Standards Codification ("ASC") Topic 326, Financial Instruments - Credit Losses, ("CECL") (see "Recent Accounting Pronouncements" below). As a result, the Company changed its accounting policy for allowance for credit losses. The accounting policy pursuant to CECL is disclosed below. The adoption of CECL resulted in an immaterial cumulative effect adjustment recorded in retained earnings as of July 1, 2020. 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 and Equipment	Property and equipment is stated 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 with an indefinite life (goodwill), over an estimated economic benefit period, generally three to twenty years. The Company reviews its long-lived assets and identifiable intangible assets with finite lives for impairment whenever events or changes in circumstances have indicated that it is more likely than not that the carrying amount of its assets might not be recoverable. The Company evaluates goodwill for impairment of value on an annual basis as of January 1 and between annual tests if events or changes in circumstances indicate that it is more likely than not that the asset might be impaired.
Comprehensive Income	Comprehensive income for each of the fiscal years ending June 30, 2021, 2020, and 2019 equals the Company’s net income.
Reportable Segment Information	n accordance with U.S. GAAP, the Company's operations are classified as four reportable segments: Core, Payments, Complementary, and Corporate and Other (see Note 14). Substantially all the Company’s revenues are derived from operations and assets located within the United States of America.
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 short-term borrowings on its existing credit facilities. The share repurchase program does not include specific price targets or timetables and may be suspended at any time.
Earnings Per Share	Per share information is based on the weighted average number of common shares outstanding during the year. Stock options and restricted stock have been included in the calculation of income per diluted share to the extent they are dilutive. The difference between basic and diluted weighted average shares outstanding is the dilutive effect of outstanding stock options and restricted stock (see Note 11).
Income Taxes	Deferred tax liabilities and assets are recognized for the tax effects of differences between the financial statement and tax bases 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)

12 Months Ended

Jun. 30, 2021

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

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Risks and Uncertainties

The novel coronavirus ("COVID-19") pandemic adversely impacted global economic activity and contributed to significant volatility in financial markets during 2020 and in 2021 year to date.

The extent to which the COVID-19 pandemic will directly or indirectly impact our business and financial results, including revenue, expenses, cost of revenues, research and development, and selling, general and administrative expenses, will depend on future developments that are highly uncertain, such as new information that may emerge concerning COVID-19 and the actions taken to contain or treat COVID-19 (including the efficacy and distribution of vaccines), as well as the economic impact on local, regional, national and international customers and markets. The Company assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to the Company and the unknown future impacts of COVID-19 as of and for its fiscal year ended June 30, 2021 and through the date of this report. The accounting matters assessed included, but were not limited to, the Company’s allowance for credit losses, as well as the carrying value of goodwill and other long-lived assets. While there was not a material impact to the Company’s consolidated financial statements, the Company’s future assessment of the magnitude and duration of COVID-19, as well as other factors, could result in material impacts to the Company’s consolidated financial statements in future reporting periods.

Revenue Recognition

The Company generates "Services and Support" revenue through software licensing and related services, private cloud core and complementary software solutions, professional services, and hardware sales. The Company generates "Processing" revenue through processing of remittance transactions, card transactions and monthly fees, and digital transactions.

Significant Judgments in Application of the Guidance

Identification of Performance Obligations

The Company enters into contracts with customers that may include multiple types of goods and services. At contract inception, the Company assesses the solutions and services promised in its contracts with customers and identifies a performance obligation for each promise to transfer to the customer a solution or service (or bundle of solutions or services) that is distinct - that is, if the solution or service is separately identifiable from other items in the arrangement and if the customer can benefit from the solution or service on its own or together with other resources that are readily available. Significant judgment is used in the identification and accounting for all performance obligations.

Determination of Transaction Price

The amount of revenue recognized is based on the consideration the Company expects to receive in exchange for transferring goods and services to the customer. The Company’s contracts with its customers frequently contain some component of variable consideration. The Company estimates variable consideration in its contracts primarily using the expected value method, based on both historical and current information. Where appropriate, the Company may constrain the estimated variable consideration included in the transaction price in the event of a high degree of uncertainty as to the final consideration amount. Significant judgment is used in the estimate of variable consideration of customer contracts that are long-term and include uncertain transactional volumes.

Technology or service components from third parties are frequently included in or combined with the Company’s applications or service offerings. Whether the Company recognizes revenue based on the gross amount billed to the customer or the net amount retained involves judgment in determining whether the Company controls the good or service before it is transferred to the customer. This assessment is made at the performance obligation level.

Allocation of Transaction Price

The transaction price, once determined, is allocated between the various performance obligations in the contract based upon their relative standalone selling prices. The standalone selling prices are determined based on the prices at which the Company separately sells each good or service. For items that are not sold separately, the Company estimates the standalone selling prices using all information that is reasonably available, including reference to historical pricing data.

Computer Software Development

The Company capitalizes new product development costs incurred for software to be sold from the point at which technological feasibility has been established through the point at which the product is ready for general availability. Software development costs that are capitalized are evaluated on a product-by-product basis annually for impairment and are assigned an estimated economic life based on the type of product, market characteristics, and maturity of the market for that particular product. These costs are amortized based on current and estimated future revenue from the product or on a straight-line basis, whichever yields greater amortization expense. All of this amortization expense is included within components of operating income, primarily cost of revenue.

Internal Use Software

The Company capitalizes development costs for internal use software beginning at the start of application development. Amortization begins on the date the software is placed in service and the amortization period is based on estimated useful life.

Cash Equivalents

The Company considers all highly liquid investments with maturities of three months or less at the time of acquisition to be cash equivalents.

Accounts Receivable

Receivables are recorded at the time of billing. On July 1, 2020, the Company adopted FASB Accounting Standards Codification ("ASC") Topic 326, Financial Instruments - Credit Losses, ("CECL") (see "Recent Accounting Pronouncements" below). As a result, the Company changed its accounting policy for allowance for credit losses. The accounting policy pursuant to CECL is disclosed below. The adoption of CECL resulted in an immaterial cumulative effect adjustment recorded in retained earnings as of July 1, 2020.

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 and Equipment

Property and equipment is stated 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 with an indefinite life (goodwill), over an estimated economic benefit period, generally three to twenty years.

The Company reviews its long-lived assets and identifiable intangible assets with finite lives for impairment whenever events or changes in circumstances have indicated that it is more likely than not that the carrying amount of its assets might not be recoverable. The Company evaluates goodwill for impairment of value on an annual basis as of January 1 and between annual tests if events or changes in circumstances indicate that it is more likely than not that the asset might be impaired.

Comprehensive Income

Comprehensive income for each of the fiscal years ending June 30, 2021, 2020, and 2019 equals the Company’s net income.

Reportable Segment Information

n accordance with U.S. GAAP, the Company's operations are classified as four reportable segments: Core, Payments, Complementary, and Corporate and Other (see Note 14). Substantially all the Company’s revenues are derived from operations and assets located within the United States of America.

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 short-term borrowings on its existing credit facilities. The share repurchase program does not include specific price targets or timetables and may be suspended at any time.

Earnings Per Share

Per share information is based on the weighted average number of common shares outstanding during the year. Stock options and restricted stock have been included in the calculation of income per diluted share to the extent they are dilutive. The difference between basic and diluted weighted average shares outstanding is the dilutive effect of outstanding stock options and restricted stock (see Note 11).

Income Taxes

Deferred tax liabilities and assets are recognized for the tax effects of differences between the financial statement and tax bases 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.