Significant Accounting Policies (Policies)	12 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations - The Company is a leading worldwide diversified manufacturer of motion and control technologies and systems, providing precision engineered solutions for a wide variety of mobile, industrial and aerospace markets. We evaluate performance based on segment operating income before corporate administrative expenses, interest expense and income taxes. The Diversified Industrial Segment is an aggregation of several business units, which manufacture motion-control and fluid power system components for builders and users of various types of manufacturing, packaging, processing, transportation, agricultural, construction, and military vehicles and equipment. Diversified Industrial Segment products are marketed primarily through field sales employees and independent distributors. The Diversified Industrial North American operations have manufacturing plants and distribution networks throughout the United States, Canada and Mexico and primarily service North America. The Diversified Industrial International operations provide Parker products and services to 42 countries throughout Europe, Asia Pacific, Latin America, the Middle East and Africa. The Aerospace Systems Segment produces hydraulic, fuel, pneumatic and electro-mechanical systems and components, which are utilized on virtually every domestic commercial, military and general aviation aircraft and also performs a vital role in naval vessels and land-based weapons systems. This segment serves original equipment and maintenance, repair and overhaul customers worldwide. Aerospace Systems Segment products are marketed by field sales employees and are sold directly to manufacturers and end users. There are no individual customers to whom sales are more than three percent of the Company's consolidated sales. Due to our diverse group of customers throughout the world, we do not consider ourself exposed to any concentration of credit risks. The Company manufactures and markets its products throughout the world. Although certain risks and uncertainties exist, the diversity and breadth of our products and geographic operations mitigate the risk that adverse changes with respect to any particular product and geographic operation would materially affect our operating results.
Use of Estimates	Use of Estimates - The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Basis of Consolidation	Basis of Consolidation - The consolidated financial statements include the accounts of all majority-owned domestic and foreign subsidiaries. All intercompany transactions and profits have been eliminated in the consolidated financial statements. The Company does not have off-balance sheet arrangements. Within the Business Segment Information, intersegment and interarea sales have been eliminated.
Revenue Recognition	Revenue Recognition - Revenues are recognized when control of performance obligations, which are distinct goods or services within the contract, is transferred to the customer. Control is transferred when the customer has the ability to direct the use of and obtain the benefits from the goods or services. When revenue is recognized at a point in time, control generally transfers at time of shipment. Revenues are recognized over time if the customer simultaneously receives control as the Company performs work under a contract, if the customer controls the asset as it is being produced, or if the product produced for the customer has no alternative use and the Company has a contractual right to payment. For contracts where revenue is recognized over time, we use the cost-to-cost, efforts expended or units of delivery method depending on the nature of the contract, including length of production time. The estimation of these costs and efforts expended requires judgment on the part of management due to the duration of the contractual agreements as well as the technical nature of the products involved. We make adjustments to these estimates on a consistent basis and establish a contract reserve when the estimated costs to complete a contract exceed the expected contract revenues. A contract’s transaction price is allocated to each distinct performance obligation. When there are multiple performance obligations within a contract, the transaction price is allocated to each performance obligation based on its standalone selling price. The primary method used to estimate a standalone selling price is the price observed in standalone sales to customers of the same product or service. Revenue is recognized when control of the individual performance obligations is transferred to the customer. We consider the contractual consideration payable by the customer and assesses variable consideration that may affect the total transaction price. Variable consideration primarily includes prompt pay discounts, rebates and volume discounts and is included in the estimated transaction price when there is a basis to reasonably estimate the amount, including whether the estimate should be constrained in order to avoid a significant reversal of revenue in a future period. These estimates are based on historical experience, anticipated performance under the terms of the contract and our best judgment at the time. Payment terms vary by customer and the geographic location of the customer. The time between when revenue is recognized and payment is due is not significant. Our contracts with customers generally do not include significant financing components or noncash consideration. Taxes collected from customers and remitted to governmental authorities are excluded from revenue. Shipping and handling costs are treated as fulfillment costs and are included in cost of sales. The costs to obtain a contract where the amortization period for the related asset is one year or less are expensed as incurred. There is generally no unilateral right to return products. The Company primarily offers an assurance-type standard warranty that the product will conform to certain specifications for a defined period of time or usage after delivery. This type of warranty does not represent a separate performance obligation.
Cash	Cash - Cash equivalents consist of short-term, highly liquid investments with a maturity of three months or less. These investments are carried at cost plus accrued interest and are readily convertible into cash.
Marketable Securities and Other Investments	Marketable Securities and Other Investments - Consist of short-term, highly liquid investments with stated maturities of greater than three months from the date of purchase, which are carried at cost plus accrued interest. Marketable securities and other investments also include investments in equity securities which are carried at fair value. Changes in fair value related to equity securities are recorded in net income. We have the ability to liquidate these investments after giving appropriate notice to the issuer.
Trade Accounts Receivable, Net	Trade Accounts Receivable, Net - Trade accounts receivable are initially recorded at their net collectible amount and are generally recorded at the time the revenue from the sales transaction is recorded. We evaluate the collectibility of our receivables based on historical experience and current and forecasted economic conditions based on management's judgment. Additionally, receivables are written off to bad debt when management makes a final determination of uncollectibility.
Plant, Equipment and Depreciation	Plant, Equipment and Depreciation - Plant and equipment are recorded at cost and are depreciated principally using the straight-line method for financial reporting purposes. Depreciation rates are based on estimated useful lives of the assets, generally 40 years for buildings, 15 years for land improvements and building equipment, seven to 10 years for machinery and equipment, and three to eight years for vehicles and office equipment. Improvements, which extend the useful life of property, are capitalized, and maintenance and repairs are expensed. We review plant and equipment for impairment whenever events or changes in circumstances indicate that their carrying value may not be recoverable. When plant and equipment are retired or otherwise disposed of, the cost and accumulated depreciation are removed from the appropriate accounts and any gain or loss is included in current income.
Investments and Other Assets	Investments and Other Assets - Investments in joint-venture companies in which ownership is 50 percent or less and in which the Company does not have operating control are stated at cost plus the Company's equity in undistributed earnings and amounted to $292,217 and $317,975 at June 30, 2021 and 2020, respectively. A significant portion of the underlying net assets of the joint ventures are related to goodwill.
Intangible Assets	Intangible Assets - Intangible assets primarily include patents and technology, trademarks and customer lists and contracts and are recorded at cost and amortized on a straight-line method. Patents and technology are amortized over the shorter of their remaining useful or legal life. Trademarks and customer contracts are amortized over the estimated time period over which an economic benefit is expected to be received. Customer lists are amortized over a period based on anticipated customer attrition rates. The Company reviews intangible assets for impairment whenever events or changes in circumstances indicate that their carrying value may not be recoverable.
Goodwill	Goodwill - The Company conducts a formal impairment test of goodwill on an annual basis and between annual tests if an event occurs or circumstances change that would, more likely than not, reduce the fair value of a reporting unit below its carrying value.
Income Taxes	Income Taxes - Income taxes are provided based upon income for financial reporting purposes. Tax credits and similar tax incentives are applied to reduce the provision for income taxes in the year in which the credits arise. We recognize accrued interest related to unrecognized tax benefits in income tax expense. Penalties, if incurred, are recognized in income tax expense. Deferred income taxes arise from temporary differences in the recognition of income and expense for tax purposes. Income tax effects resulting from adjusting temporary differences recorded in accumulated other comprehensive (loss) are released when the circumstances on which they are based cease to exist.
Foreign Currency Translation	Foreign Currency Translation - Assets and liabilities of foreign subsidiaries are translated at current exchange rates, and income and expenses are translated using weighted-average exchange rates. The effects of these translation adjustments, as well as gains and losses from certain intercompany transactions, are reported in accumulated other comprehensive (loss). Such adjustments will affect net income only upon sale or liquidation of the underlying foreign investments. Exchange (gains) losses from transactions in a currency other than the local currency of the entity involved are included within the cost of sales caption in the Consolidated Statement of Income and were $(10,948), $(10,018) and $5,888, in 2021, 2020 and 2019, respectively.
Subsequent Events	Subsequent Events - We evaluated subsequent events that have occurred through the date of filing of this Annual Report on Form 10-K for the year ended June 30, 2021. On August 2, 2021, the Company announced that it reached an agreement on the terms of a recommended cash acquisition of the entire issued and to be issued ordinary share capital of Meggitt plc ("Meggitt") for 800 pence per share (the "Acquisition"), or approximately £6,308 million. We intend to fund the proposed Acquisition with cash and new debt. The proposed Acquisition remains subject to customary closing conditions, including regulatory clearances and approval by Meggitt’s shareholders. In connection with the proposed Acquisition, the Company entered into a bridge credit agreement (the "Bridge Credit Agreement") on August 2, 2021. Under the Bridge Credit Agreement, lenders are committed to provide senior, unsecured financing in the aggregate principal amount of £6,524 million. Any borrowings made under the Bridge Credit Agreement would mature 364 days from the initial funding date. The commitments are intended to be drawn to finance the proposed Acquisition only to the extent that we do not arrange for alternative financing prior to closing.
Recent Accounting Pronouncements	Recent Accounting Pronouncements - In June 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-13, "Measurement of Credit Losses on Financial Instruments." ASU 2016-13 requires a financial asset (or a group of financial assets) measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. Credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. ASU 2016-13 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2019. We adopted ASU 2016-13 on July 1, 2020. The adoption of this guidance, using the modified retrospective method, did not result in a cumulative-effect adjustment to retained earnings and did not have a material impact on the consolidated financial statements or related disclosures.

Significant Accounting Policies (Policies)

12 Months Ended

Jun. 30, 2021

Nature of Operations - The Company is a leading worldwide diversified manufacturer of motion and control technologies and systems, providing precision engineered solutions for a wide variety of mobile, industrial and aerospace markets. We evaluate performance based on segment operating income before corporate administrative expenses, interest expense and income taxes.

The Diversified Industrial Segment is an aggregation of several business units, which manufacture motion-control and fluid power system components for builders and users of various types of manufacturing, packaging, processing, transportation, agricultural, construction, and military vehicles and equipment. Diversified Industrial Segment products are marketed primarily through field sales employees and independent distributors. The Diversified Industrial North American operations have manufacturing plants and distribution networks throughout the United States, Canada and Mexico and primarily service North America. The Diversified Industrial International operations provide Parker products and services to 42 countries throughout Europe, Asia Pacific, Latin America, the Middle East and Africa.

The Aerospace Systems Segment produces hydraulic, fuel, pneumatic and electro-mechanical systems and components, which are utilized on virtually every domestic commercial, military and general aviation aircraft and also performs a vital role in naval vessels and land-based weapons systems. This segment serves original equipment and maintenance, repair and overhaul customers worldwide. Aerospace Systems Segment products are marketed by field sales employees and are sold directly to manufacturers and end users.

There are no individual customers to whom sales are more than three percent of the Company's consolidated sales. Due to our diverse group of customers throughout the world, we do not consider ourself exposed to any concentration of credit risks.

The Company manufactures and markets its products throughout the world. Although certain risks and uncertainties exist, the diversity and breadth of our products and geographic operations mitigate the risk that adverse changes with respect to any particular product and geographic operation would materially affect our operating results.

Use of Estimates

Use of Estimates - The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Basis of Consolidation

Basis of Consolidation - The consolidated financial statements include the accounts of all majority-owned domestic and foreign subsidiaries. All intercompany transactions and profits have been eliminated in the consolidated financial statements. The Company does not have off-balance sheet arrangements. Within the Business Segment Information, intersegment and interarea sales have been eliminated.

Revenue Recognition

Revenue Recognition - Revenues are recognized when control of performance obligations, which are distinct goods or services within the contract, is transferred to the customer. Control is transferred when the customer has the ability to direct the use of and obtain the benefits from the goods or services. When revenue is recognized at a point in time, control generally transfers at time of shipment. Revenues are recognized over time if the customer simultaneously receives control as the Company performs work under a contract, if the customer controls the asset as it is being produced, or if the product produced for the customer has no alternative use and the Company has a contractual right to payment.

For contracts where revenue is recognized over time, we use the cost-to-cost, efforts expended or units of delivery method depending on the nature of the contract, including length of production time. The estimation of these costs and efforts expended requires judgment on the part of management due to the duration of the contractual agreements as well as the technical nature of the products involved. We make adjustments to these estimates on a consistent basis and establish a contract reserve when the estimated costs to complete a contract exceed the expected contract revenues.

A contract’s transaction price is allocated to each distinct performance obligation. When there are multiple performance obligations within a contract, the transaction price is allocated to each performance obligation based on its standalone selling price. The primary method used to estimate a standalone selling price is the price observed in standalone sales to customers of the same product or service. Revenue is recognized when control of the individual performance obligations is transferred to the customer.

We consider the contractual consideration payable by the customer and assesses variable consideration that may affect the total transaction price. Variable consideration primarily includes prompt pay discounts, rebates and volume discounts and is included in the estimated transaction price when there is a basis to reasonably estimate the amount, including whether the estimate should be constrained in order to avoid a significant reversal of revenue in a future period. These estimates are based on historical experience, anticipated performance under the terms of the contract and our best judgment at the time.

Payment terms vary by customer and the geographic location of the customer. The time between when revenue is recognized and payment is due is not significant. Our contracts with customers generally do not include significant financing components or noncash consideration.

Taxes collected from customers and remitted to governmental authorities are excluded from revenue. Shipping and handling costs are treated as fulfillment costs and are included in cost of sales. The costs to obtain a contract where the amortization period for the related asset is one year or less are expensed as incurred.

There is generally no unilateral right to return products. The Company primarily offers an assurance-type standard warranty that the product will conform to certain specifications for a defined period of time or usage after delivery. This type of warranty does not represent a separate performance obligation.

Cash

Cash - Cash equivalents consist of short-term, highly liquid investments with a maturity of three months or less. These investments are carried at cost plus accrued interest and are readily convertible into cash.

Marketable Securities and Other Investments

Marketable Securities and Other Investments - Consist of short-term, highly liquid investments with stated maturities of greater than three months from the date of purchase, which are carried at cost plus accrued interest. Marketable securities and other investments also include investments in equity securities which are carried at fair value. Changes in fair value related to equity securities are recorded in net income. We have the ability to liquidate these investments after giving appropriate notice to the issuer.

Trade Accounts Receivable, Net

Trade Accounts Receivable, Net - Trade accounts receivable are initially recorded at their net collectible amount and are generally recorded at the time the revenue from the sales transaction is recorded. We evaluate the collectibility of our receivables based on historical experience and current and forecasted economic conditions based on management's judgment. Additionally, receivables are written off to bad debt when management makes a final determination of uncollectibility.

Plant, Equipment and Depreciation

Plant, Equipment and Depreciation - Plant and equipment are recorded at cost and are depreciated principally using the straight-line method for financial reporting purposes. Depreciation rates are based on estimated useful lives of the assets, generally 40 years for buildings, 15 years for land improvements and building equipment, seven to 10 years for machinery and equipment, and three to eight years for vehicles and office equipment. Improvements, which extend the useful life of property, are capitalized, and maintenance and repairs are expensed. We review plant and equipment for impairment whenever events or changes in circumstances indicate that their carrying value may not be recoverable. When plant and equipment are retired or otherwise disposed of, the cost and accumulated depreciation are removed from the appropriate accounts and any gain or loss is included in current income.

Investments and Other Assets

Investments and Other Assets - Investments in joint-venture companies in which ownership is 50 percent or less and in which the Company does not have operating control are stated at cost plus the Company's equity in undistributed earnings and amounted to $292,217 and $317,975 at June 30, 2021 and 2020, respectively. A significant portion of the underlying net assets of the joint ventures are related to goodwill.

Intangible Assets

Intangible Assets - Intangible assets primarily include patents and technology, trademarks and customer lists and contracts and are recorded at cost and amortized on a straight-line method. Patents and technology are amortized over the shorter of their remaining useful or legal life. Trademarks and customer contracts are amortized over the estimated time period over which an economic benefit is expected to be received. Customer lists are amortized over a period based on anticipated customer attrition rates. The Company reviews intangible assets for impairment whenever events or changes in circumstances indicate that their carrying value may not be recoverable.

Goodwill

Goodwill - The Company conducts a formal impairment test of goodwill on an annual basis and between annual tests if an event occurs or circumstances change that would, more likely than not, reduce the fair value of a reporting unit below its carrying value.

Income Taxes

Income Taxes - Income taxes are provided based upon income for financial reporting purposes. Tax credits and similar tax incentives are applied to reduce the provision for income taxes in the year in which the credits arise. We recognize accrued interest related to unrecognized tax benefits in income tax expense. Penalties, if incurred, are recognized in income tax expense. Deferred income taxes arise from temporary differences in the recognition of income and expense for tax purposes. Income tax effects resulting from adjusting temporary differences recorded in accumulated other comprehensive (loss) are released when the circumstances on which they are based cease to exist.

Foreign Currency Translation

Foreign Currency Translation - Assets and liabilities of foreign subsidiaries are translated at current exchange rates, and income and expenses are translated using weighted-average exchange rates. The effects of these translation adjustments, as well as gains and losses from certain intercompany transactions, are reported in accumulated other comprehensive (loss). Such adjustments will affect net income only upon sale or liquidation of the underlying foreign investments. Exchange (gains) losses from transactions in a currency other than the local currency of the entity involved are included within the cost of sales caption in the Consolidated Statement of Income and were $(10,948), $(10,018) and $5,888, in 2021, 2020 and 2019, respectively.

Subsequent Events

Subsequent Events - We evaluated subsequent events that have occurred through the date of filing of this Annual Report on Form 10-K for the year ended June 30, 2021. On August 2, 2021, the Company announced that it reached an agreement on the terms of a recommended cash acquisition of the entire issued and to be issued ordinary share capital of Meggitt plc ("Meggitt") for 800 pence per share (the "Acquisition"), or approximately £6,308 million. We intend to fund the proposed Acquisition with cash and new debt. The proposed Acquisition remains subject to customary closing conditions, including regulatory clearances and approval by Meggitt’s shareholders.

In connection with the proposed Acquisition, the Company entered into a bridge credit agreement (the "Bridge Credit Agreement") on August 2, 2021. Under the Bridge Credit Agreement, lenders are committed to provide senior, unsecured financing in the aggregate principal amount of £6,524 million. Any borrowings made under the Bridge Credit Agreement would mature 364 days from the initial funding date. The commitments are intended to be drawn to finance the proposed Acquisition only to the extent that we do not arrange for alternative financing prior to closing.

Recent Accounting Pronouncements

Recent Accounting Pronouncements - In June 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-13, "Measurement of Credit Losses on Financial Instruments." ASU 2016-13 requires a financial asset (or a group of financial assets) measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. Credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. ASU 2016-13 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2019. We adopted ASU 2016-13 on July 1, 2020. The adoption of this guidance, using the modified retrospective method, did not result in a cumulative-effect adjustment to retained earnings and did not have a material impact on the consolidated financial statements or related disclosures.