New Accounting Pronouncements (Policies)	9 Months Ended
Feb. 29, 2016
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 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 2014, the FASB issued 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 its investment in Shred-it and will apply it to future transactions, as appropriate. In April 2015, the FASB issued ASU 2015-17, “Balance Sheet Classifications of Deferred Taxes,” which amended accounting guidance related to the presentation of deferred tax liabilities and assets. The amended guidance requires that all deferred tax liabilities and assets be classified as noncurrent on the balance sheet. This guidance is effective for reporting periods beginning after December 15, 2016; however, early adoption is permitted. This guidance can also be applied either prospectively to all deferred tax liabilities and assets or retrospectively to all periods presented. Cintas adopted ASU 2015-17 during the quarter ended November 30, 2015 and has applied this amended accounting guidance to its deferred tax liabilities and assets for all periods presented. The impact of this change in accounting principle on balances previously reported as of May 31, 2015 was a reclassification of $112.4 million from current liabilities to long term liabilities. 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. No other new accounting pronouncement recently issued or newly effective had or is expected to have a material impact on the 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 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 2014, the FASB issued 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 its investment in Shred-it and will apply it to future transactions, as appropriate.

In April 2015, the FASB issued ASU 2015-17, “Balance Sheet Classifications of Deferred Taxes,” which amended accounting guidance related to the presentation of deferred tax liabilities and assets. The amended guidance requires that all deferred tax liabilities and assets be classified as noncurrent on the balance sheet. This guidance is effective for reporting periods beginning after December 15, 2016; however, early adoption is permitted. This guidance can also be applied either prospectively to all deferred tax liabilities and assets or retrospectively to all periods presented. Cintas adopted ASU 2015-17 during the quarter ended November 30, 2015 and has applied this amended accounting guidance to its deferred tax liabilities and assets for all periods presented. The impact of this change in accounting principle on balances previously reported as of May 31, 2015 was a reclassification of $112.4 million from current liabilities to long term liabilities.

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.

No other new accounting pronouncement recently issued or newly effective had or is expected to have a material impact on the consolidated condensed financial statements.