Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jan. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of Donaldson Company, Inc. and its subsidiaries (the Company) have been prepared in accordance with generally accepted accounting principles (GAAP) in the United States (U.S.) and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair statement of earnings, comprehensive income, financial position, cash flows and changes in stockholders’ equity have been included and are of a normal recurring nature. Operating results for the three and six months ended January 31, 2022 are not necessarily indicative of the results that may be expected for future periods. The year end Condensed Consolidated Balance Sheet information was derived from the Company’s Audited Consolidated Financial Statements but does not include all disclosures required by GAAP. For further information, refer to the Audited Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended July 31, 2021.
Principles of Consolidation	Principles of ConsolidationThe Condensed Consolidated Financial Statements include the accounts of the Company and all of its majority-owned subsidiaries. All intercompany accounts and transactions have been eliminated. The Company’s joint ventures are not majority-owned and are accounted for under the equity method.
Use of Estimates	Use of Estimates The preparation of the Company’s financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amount of assets and liabilities and the disclosures regarding contingent assets and liabilities at period end and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. The effects of the ongoing Coronavirus (COVID-19) pandemic continue to impact global economic conditions. The Company continues to experience supply chain disruptions, including global logistics and labor challenges and constrained supplies of steel, petrochemical products and filter media. These disruptions have slowed the Company’s production speed and increased lead times. The Company has undertaken steps to mitigate these negative impacts, such as qualifying additional suppliers. These disruptions impeded the Company’s ability to meet strengthening demand. This dynamic impacted results in the first half of fiscal 2022 and is expected to continue throughout fiscal 2022.
New Accounting Standards Not Yet Adopted	New Accounting Standards Not Yet Adopted The Company considers the applicability and impact of the Financial Accounting Standards Board’s (FASB) Accounting Standards Updates (ASUs) issued but not yet adopted. In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This ASU clarifies that an acquirer of a business should recognize and measure contract assets and contract liabilities in a business combination in accordance with ASU 2014-9, Revenue from Contracts with Customers (Topic 606) as if the entity had originated the contracts. The guidance is effective for fiscal years beginning after December 15, 2022, with early application permitted. This ASU is applicable to the Company’s fiscal year beginning in the first quarter of fiscal 2024. The Company is currently evaluating the impact the adoption will have on its financial statements.