New Accounting Pronouncements	3 Months Ended
Aug. 31, 2017
Accounting Policies [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (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. A cross-functional implementation team has been established consisting of representatives from all of our operating segments. The implementation team is working to analyze the impact of the standard on Cintas' contract portfolio by reviewing current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to revenue contracts. In addition, we are in the process of identifying and implementing the appropriate changes to business processes and controls to support recognition and disclosure under the new standard. Cintas plans to adopt the standard as of the first quarter of fiscal year 2019 using the modified retrospective adoption alternative under this standard and therefore it is anticipated we will record a cumulative adjustment to retained earnings as of June 1, 2018. Cintas is continuing to evaluate the impact of ASU 2014-09 and an estimate of the impact to the consolidated condensed financial statements cannot be made at this time. 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, ASC 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 January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates the two-step process that required identification of potential impairment and a separate measure of the actual impairment. Goodwill impairment charges, if any, would be determined by the difference between a reporting unit's carrying value and its fair value (impairment loss is limited to the carrying value). This standard is effective for annual or any interim goodwill impairment tests beginning after December 15, 2019. The adoption of this standard is not expected to have a material impact on the consolidated condensed financial statements. In March 2017, the FASB issued ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Costs.” ASU 2017-07 requires the service component of pension and other postretirement benefit costs to be presented in the same line item as other employee compensation costs on the consolidated condensed statement of income; however, the other components of net benefit costs are required to be presented outside of operating income within the consolidated condensed statements of income. Cintas retrospectively adopted ASU 2017-07 on June 1, 2017. 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 May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (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. A cross-functional implementation team has been established consisting of representatives from all of our operating segments. The implementation team is working to analyze the impact of the standard on Cintas' contract portfolio by reviewing current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to revenue contracts. In addition, we are in the process of identifying and implementing the appropriate changes to business processes and controls to support recognition and disclosure under the new standard. Cintas plans to adopt the standard as of the first quarter of fiscal year 2019 using the modified retrospective adoption alternative under this standard and therefore it is anticipated we will record a cumulative adjustment to retained earnings as of June 1, 2018. Cintas is continuing to evaluate the impact of ASU 2014-09 and an estimate of the impact to the consolidated condensed financial statements cannot be made at this time.

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, ASC 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 January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates the two-step process that required identification of potential impairment and a separate measure of the actual impairment. Goodwill impairment charges, if any, would be determined by the difference between a reporting unit's carrying value and its fair value (impairment loss is limited to the carrying value). This standard is effective for annual or any interim goodwill impairment tests beginning after December 15, 2019. The adoption of this standard is not expected to have a material impact on the consolidated condensed financial statements.

In March 2017, the FASB issued ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Costs.” ASU 2017-07 requires the service component of pension and other postretirement benefit costs to be presented in the same line item as other employee compensation costs on the consolidated condensed statement of income; however, the other components of net benefit costs are required to be presented outside of operating income within the consolidated condensed statements of income. Cintas retrospectively adopted ASU 2017-07 on June 1, 2017.

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.