Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Feb. 29, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The consolidated condensed financial statements of Cintas Corporation (Cintas, the Company, we, us or our) included herein have been prepared by Cintas, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with United States generally accepted accounting principles (U.S. GAAP) have been condensed or omitted pursuant to such rules and regulations. While we believe that the disclosures are adequately presented, we suggest that these consolidated condensed financial statements be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the fiscal year ended May 31, 2023 (Annual Report) filed with the SEC on July 27, 2023. See Note 1 entitled Significant Accounting Policies of "Notes to Consolidated Financial Statements" of that Annual Report for a summary of our significant accounting policies. There have been no material changes in the accounting policies followed by Cintas during the current fiscal year. Interim results are subject to variations and are not necessarily indicative of the results of operations for a full fiscal year. In the opinion of management, adjustments (which include only normal recurring adjustments) necessary for a fair statement of the consolidated results of the interim periods shown have been made.
Inventory	Inventories, net are valued at the lower of cost (first-in, first-out) or net realizable value.The inventory obsolescence reserve is determined by specific identification, as well as an estimate based on Cintas' historical rates of obsolescence. Once a specific inventory item is written down to the lower of cost or net realizable value, a new cost basis has been established, and that inventory item cannot subsequently be marked up.
New Accounting Pronouncements	In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2023-07, Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures (ASU 2023-07). ASU 2023-07 requires additional disclosures pertaining to significant expenses and other items of an entity’s reportable operating segments. ASU 2023-07 is effective for annual periods beginning after December 15, 2023 (fiscal 2025). Early adoption is permitted. The Company is currently evaluating the impact of ASU 2023-07 on the consolidated condensed financial statements. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740), Improvements to Income Tax Disclosures (ASU 2023-09), which expands disclosures in an entity’s income tax rate reconciliation table and regarding cash taxes paid both in the U.S. and foreign jurisdictions. ASU 2023-09 will be effective for annual periods beginning after December 15, 2024 (fiscal 2026). The Company is currently evaluating the impact of ASU 2023-09 on the consolidated condensed financial statements. There are no other accounting pronouncements recently issued or newly effective that had, or are expected to have, a material impact on Cintas' consolidated condensed financial statements.

Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.