New Accounting Pronouncements (Policies)	3 Months Ended
Aug. 31, 2016
Accounting Policies [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements In April 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,” which amended accounting guidance related to the reporting of discontinued operations and disclosures of disposals of components of an entity. The amended guidance changes the thresholds for disposals to qualify as discontinued operations and requires additional disclosures. This guidance is effective for reporting periods beginning after December 15, 2014 and is required to be applied prospectively. Cintas adopted ASU 2014-08 during the quarter ended August 31, 2015 and applied the amended accounting guidance to Shred-it and will apply it to future transactions, as appropriate. In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," to clarify revenue recognition principles. This guidance is intended to improve disclosure requirements and enhance the comparability of revenue recognition practices. Improved disclosures under the amended guidance relate to the nature, amount, timing and uncertainty of revenue that is recognized from contracts with customers. This guidance will be effective for reporting periods beginning after December 15, 2017 and will be required to be applied retrospectively. Early application of the amendments in this update is not permitted. Cintas is currently evaluating the impact that ASU 2014-09 will have on its consolidated condensed financial statements. In April 2015, the FASB issued ASU 2015-03, "Interest - Imputation of Interest (Subtopic 835-30), Simplifying the Presentation of Debt Issuance Costs." ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the consolidated condensed balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. This guidance is effective for annual and interim periods beginning after December 15, 2015. The guidance is applied retrospectively and early adoption is permitted. Cintas adopted ASU 2015-03 during the quarter ended August 31, 2016 and has applied this amended accounting guidance to its long-term debt and other assets for all periods presented. The impact of this change in accounting principle on balances previously reported as of May 31, 2016 was a reclassification of $5.6 million from other assets to long-term liabilities. In September 2015, the FASB issued ASU 2015-16, “Business Combinations (Topic 805), Simplifying the Accounting for Measurement-Period Adjustments.” This amendment eliminates the requirement to retrospectively account for adjustments made to provisional amounts recognized in a business combination. This amendment became effective for Cintas beginning June 1, 2016, and was adopted prospectively in accordance with the standard. The adoption of this amendment did not have an effect on our consolidated condensed financial statements for the quarter ended August 31, 2016. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. Topic 842 supersedes the previous leases standard, Accounting Standard Codification 840, "Leases." This guidance is effective for reporting periods beginning after December 15, 2018, however early adoption is permitted. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. Cintas is currently evaluating the impact that ASU 2016-02 will have on its consolidated condensed financial statements. In March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting." ASU 2016-09 is intended to simplify accounting for share-based payments. Upon adoption, ASU 2016-09 requires that excess tax benefits for share-based payments be recorded as a reduction of income tax expense and reflected within operating cash flows rather than being recorded within equity and reflected within financing cash flows. The standard also permits the repurchase of more of an employee’s shares for tax withholding purposes without triggering liability accounting, clarifies that all cash payments made on an employee’s behalf for withheld shares should be presented as a financing activity on our cash flows statement, and provides an accounting policy election to account for forfeitures as they occur. ASU 2016-09 is effective for interim and annual periods beginning after December 15, 2016, however early adoption is permitted. Cintas adopted ASU 2016-09 during the quarter ended August 31, 2016 and elected to make an accounting policy change to recognize forfeitures as they occur. The adoption impact on the consolidated condensed balance sheet was a cumulative-effect adjustment of $26.7 million, increasing opening retained earnings and decreasing paid-in capital. The impact of the adoption on the consolidated condensed income statement was a decrease of $17.2 million in income taxes. As a result of the adoption of ASU 2016-09, our excess tax benefit is no longer included in our calculation of diluted shares under the treasury stock method, resulting in an increase of 0.8 million shares in the effect of dilutive securities for the three months ended August 31, 2016. The election to recognize forfeitures as they occur resulted in an increase of $1.7 million in stock based compensation for the three months ended August 31, 2016. No other new accounting pronouncement recently issued or newly effective had or is expected to have a material impact on Cintas' consolidated condensed financial statements.

New Accounting Pronouncements

In April 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,” which amended accounting guidance related to the reporting of discontinued operations and disclosures of disposals of components of an entity. The amended guidance changes the thresholds for disposals to qualify as discontinued operations and requires additional disclosures. This guidance is effective for reporting periods beginning after December 15, 2014 and is required to be applied prospectively. Cintas adopted ASU 2014-08 during the quarter ended August 31, 2015 and applied the amended accounting guidance to Shred-it and will apply it to future transactions, as appropriate.

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," to clarify revenue recognition principles. This guidance is intended to improve disclosure requirements and enhance the comparability of revenue recognition practices. Improved disclosures under the amended guidance relate to the nature, amount, timing and uncertainty of revenue that is recognized from contracts with customers. This guidance will be effective for reporting periods beginning after December 15, 2017 and will be required to be applied retrospectively. Early application of the amendments in this update is not permitted. Cintas is currently evaluating the impact that ASU 2014-09 will have on its consolidated condensed financial statements.

In April 2015, the FASB issued ASU 2015-03, "Interest - Imputation of Interest (Subtopic 835-30), Simplifying the Presentation of Debt Issuance Costs." ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the consolidated condensed balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. This guidance is effective for annual and interim periods beginning after December 15, 2015. The guidance is applied retrospectively and early adoption is permitted. Cintas adopted ASU 2015-03 during the quarter ended August 31, 2016 and has applied this amended accounting guidance to its long-term debt and other assets for all periods presented. The impact of this change in accounting principle on balances previously reported as of May 31, 2016 was a reclassification of $5.6 million from other assets to long-term liabilities.

In September 2015, the FASB issued ASU 2015-16, “Business Combinations (Topic 805), Simplifying the Accounting for Measurement-Period Adjustments.” This amendment eliminates the requirement to retrospectively account for adjustments made to provisional amounts recognized in a business combination. This amendment became effective for Cintas beginning June 1, 2016, and was adopted prospectively in accordance with the standard. The adoption of this amendment did not have an effect on our consolidated condensed financial statements for the quarter ended August 31, 2016.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. Topic 842 supersedes the previous leases standard, Accounting Standard Codification 840, "Leases." This guidance is effective for reporting periods beginning after December 15, 2018, however early adoption is permitted. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. Cintas is currently evaluating the impact that ASU 2016-02 will have on its consolidated condensed financial statements.

In March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting." ASU 2016-09 is intended to simplify accounting for share-based payments. Upon adoption, ASU 2016-09 requires that excess tax benefits for share-based payments be recorded as a reduction of income tax expense and reflected within operating cash flows rather than being recorded within equity and reflected within financing cash flows. The standard also permits the repurchase of more of an employee’s shares for tax withholding purposes without triggering liability accounting, clarifies that all cash payments made on an employee’s behalf for withheld shares should be presented as a financing activity on our cash flows statement, and provides an accounting policy election to account for forfeitures as they occur. ASU 2016-09 is effective for interim and annual periods beginning after December 15, 2016, however early adoption is permitted. Cintas adopted ASU 2016-09 during the quarter ended August 31, 2016 and elected to make an accounting policy change to recognize forfeitures as they occur. The adoption impact on the consolidated condensed balance sheet was a cumulative-effect adjustment of $26.7 million, increasing opening retained earnings and decreasing paid-in capital. The impact of the adoption on the consolidated condensed income statement was a decrease of $17.2 million in income taxes. As a result of the adoption of ASU 2016-09, our excess tax benefit is no longer included in our calculation of diluted shares under the treasury stock method, resulting in an increase of 0.8 million shares in the effect of dilutive securities for the three months ended August 31, 2016. The election to recognize forfeitures as they occur resulted in an increase of $1.7 million in stock based compensation for the three months ended August 31, 2016.

No other new accounting pronouncement recently issued or newly effective had or is expected to have a material

impact on Cintas' consolidated condensed financial statements.