Income Taxes	3 Months Ended
Aug. 31, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes In the normal course of business, Cintas provides for uncertain tax positions and the related interest, and adjusts its unrecognized tax benefits and accrued interest accordingly. During the three months ended August 31, 2013, unrecognized tax benefits increased by approximately $0.2 million and accrued interest decreased by approximately $0.1 million. All U.S. federal income tax returns are closed to audit through fiscal 2010. Cintas is currently in advanced stages of various audits in certain foreign jurisdictions and certain domestic states. The years under audit cover fiscal years back to 2005. Based on the resolution of the various audits and changes in tax law, it is reasonably possible that the balance of unrecognized tax benefits could decrease by $0.6 million for the fiscal year ending May 31, 2014. On September 13, 2013, the Internal Revenue Service released final tangible property regulations under Sections 162(a) and 263(a) of the Internal Revenue Code of 1986 (Code), regarding the deduction and capitalization of expenditures related to tangible property. The final regulations replace temporary regulations that were issued in December 2011. Also released were proposed regulations under Section 168 of the Code regarding dispositions of tangible property. These final and proposed regulations will be effective for Cintas' fiscal year ending May 31, 2015. Early adoption is available, and as such, Cintas elected early adoption of the regulations on specific assets (material and supplies) resulting in a gross balance sheet reclassification of $33.6 million in fiscal 2013 between unrecognized tax benefits and the tax deferred (i.e., between long-term accrued liabilities and current deferred taxes on the Consolidated Condensed Balance Sheet). Transition guidance providing the procedural rules to comply with such regulations is expected to be released in the near term. Cintas continues to review the regulations, but does not believe there will be a material impact on Cintas' consolidated financial statements when they are fully adopted.

Income Taxes

3 Months Ended

Aug. 31, 2013

In the normal course of business, Cintas provides for uncertain tax positions and the related interest, and adjusts its unrecognized tax benefits and accrued interest accordingly. During the three months ended August 31, 2013, unrecognized tax benefits increased by approximately $0.2 million and accrued interest decreased by approximately $0.1 million.

All U.S. federal income tax returns are closed to audit through fiscal 2010. Cintas is currently in advanced stages of various audits in certain foreign jurisdictions and certain domestic states. The years under audit cover fiscal years back to 2005. Based on the resolution of the various audits and changes in tax law, it is reasonably possible that the balance of unrecognized tax benefits could decrease by $0.6 million for the fiscal year ending May 31, 2014.

On September 13, 2013, the Internal Revenue Service released final tangible property regulations under Sections 162(a) and 263(a) of the Internal Revenue Code of 1986 (Code), regarding the deduction and capitalization of expenditures related to tangible property. The final regulations replace temporary regulations that were issued in December 2011. Also released were proposed regulations under Section 168 of the Code regarding dispositions of tangible property. These final and proposed regulations will be effective for Cintas' fiscal year ending May 31, 2015. Early adoption is available, and as such, Cintas elected early adoption of the regulations on specific assets (material and supplies) resulting in a gross balance sheet reclassification of $33.6 million in fiscal 2013 between unrecognized tax benefits and the tax deferred (i.e., between long-term accrued liabilities and current deferred taxes on the Consolidated Condensed Balance Sheet). Transition guidance providing the procedural rules to comply with such regulations is expected to be released in the near term. Cintas continues to review the regulations, but does not believe there will be a material impact on Cintas' consolidated financial statements when they are fully adopted.