Debt, Derivatives and Hedging Activities	3 Months Ended
Aug. 31, 2016
Debt, Derivatives and Hedging Activities [Abstract]
Debt, Derivatives and Hedging Activities	Debt, Derivatives and Hedging Activities Cintas' senior notes are recorded at cost, net of debt issuance costs. The fair value of the senior notes is estimated using Level 2 inputs based on general market prices. The carrying value and fair value of Cintas' senior notes as of August 31, 2016 were $1,050.0 million and $1,185.1 million, respectively, and as of May 31, 2016 were $1,300.0 million and $1,416.6 million, respectively. On June 1, 2016, Cintas paid the $250.0 million five-year senior notes that matured on that date with cash on hand and proceeds from the issuance of commercial paper. Cintas’ commercial paper program has a capacity of $450.0 million that is fully supported by a backup revolving credit facility through a credit agreement with its banking group. This revolving credit facility has an accordion feature that allows for a maximum borrowing capacity of $600.0 million. On June 23, 2016, the revolving credit facility was amended to extend the maturity date from May 28, 2019 to June 22, 2021, increase the capacity from $300.0 million to $450.0 million and add an accordion feature that allows for a maximum borrowing capacity of $600.0 million. As of August 31, 2016, there was $163.8 million of commercial paper outstanding with a weighted average interest rate of 0.74% and maturity dates less than 30 days. The carrying value approximates fair value. No commercial paper or borrowings on our revolving credit facility were outstanding as of May 31, 2016. Cintas uses interest rate locks to manage our overall interest expense as interest rate locks effectively change the interest rate of specific debt issuances. The treasury locks are entered into to protect against unfavorable movements in the benchmark treasury rate related to forecasted debt issuances. Cintas used interest rate lock agreements to hedge against movements in the treasury rates at the time Cintas issued its senior notes in fiscal 2007, fiscal 2008, fiscal 2011 and fiscal 2013. The amortization of the cash flow hedges resulted in an increase to other comprehensive income of $0.4 million and $0.5 million for the three months ended August 31, 2016 and 2015, respectively. During the third quarter of fiscal 2016, Cintas entered into an interest rate lock agreement with a notional value of $550.0 million for a forecasted debt issuance. As of August 31, 2016 and May 31, 2016, the the fair value of this treasury lock was $38.8 million and $19.6 million, respectively and is recorded in long-term liabilities and as a decrease to other comprehensive income, net of tax. The interest rate lock had no impact on net income or cash flows from continuing operations for the three months ending August 31, 2016. Cintas has certain covenants related to debt agreements. These covenants limit Cintas’ ability to incur certain liens, to engage in sale-leaseback transactions and to merge, consolidate or sell all or substantially all of Cintas’ assets. These covenants also require Cintas to maintain certain debt to consolidated earnings before interest, taxes, depreciation and amortization (EBITDA) and interest coverage ratios. Cross-default provisions exist between certain debt instruments. If a default of a significant covenant were to occur, the default could result in an acceleration of the maturity of the indebtedness, impair liquidity and limit the ability to raise future capital. Cintas was in compliance with all debt covenants for all periods presented. On August 15, 2016, the Company entered into the Agreement and Plan of Merger (Merger Agreement) pursuant to which the Company will acquire all outstanding shares of G&K Services, Inc (G&K Services) for $97.50 per share in cash, for a total enterprise value of approximately $2.2 billion, including acquired net debt. It is expected that this acquisition will be financed with short and long-term debt. To that end, the credit agreement that supports the commercial paper program was amended on September 16, 2016. The amendment increased the capacity of the revolving credit facility from $450.0 million to $600.0 million and added a $250.0 million term loan facility. The $150.0 million increase in the revolving credit facility will take effect on the earlier date of either the consummation of the merger (Merger) contemplated by the Merger Agreement among the Corporation, G&K Services and Bravo Merger Sub, Inc. (Merger Sub) a wholly-owned subsidiary of Cintas, dated as of August 15, 2016, or the date on which the Merger Agreement is validly terminated. The term loan facility shall be only funded upon the consummation of the Merger. The credit agreement has an accordion feature that provides Cintas the ability to request increases to the borrowing commitments under either the Revolving Credit Facility or the Term Loan Facility of up to $250.0 million in the aggregate, subject to customary conditions. The amendment also extended the maturity date of the agreement to September 15, 2021.

Debt, Derivatives and Hedging Activities

Cintas' senior notes are recorded at cost, net of debt issuance costs. The fair value of the senior notes is estimated using Level 2 inputs based on general market prices. The carrying value and fair value of Cintas' senior notes as of August 31, 2016 were $1,050.0 million and $1,185.1 million, respectively, and as of May 31, 2016 were $1,300.0 million and $1,416.6 million, respectively. On June 1, 2016, Cintas paid the $250.0 million five-year senior notes that matured on that date with cash on hand and proceeds from the issuance of commercial paper.

Cintas’ commercial paper program has a capacity of $450.0 million that is fully supported by a backup revolving credit facility through a credit agreement with its banking group. This revolving credit facility has an accordion feature that allows for a maximum borrowing capacity of $600.0 million. On June 23, 2016, the revolving credit facility was amended to extend the maturity date from May 28, 2019 to June 22, 2021, increase the capacity from $300.0 million to $450.0 million and add an accordion feature that allows for a maximum borrowing capacity of $600.0 million. As of August 31, 2016, there was $163.8 million of commercial paper outstanding with a weighted average interest rate of 0.74% and maturity dates less than 30 days. The carrying value approximates fair value. No commercial paper or borrowings on our revolving credit facility were outstanding as of May 31, 2016.

Cintas uses interest rate locks to manage our overall interest expense as interest rate locks effectively change the interest rate of specific debt issuances. The treasury locks are entered into to protect against unfavorable movements in the benchmark treasury rate related to forecasted debt issuances. Cintas used interest rate lock agreements to hedge against movements in the treasury rates at the time Cintas issued its senior notes in fiscal 2007, fiscal 2008, fiscal 2011 and fiscal 2013. The amortization of the cash flow hedges resulted in an increase to other comprehensive income of $0.4 million and $0.5 million for the three months ended August 31, 2016 and 2015, respectively. During the third quarter of fiscal 2016, Cintas entered into an interest rate lock agreement with a notional value of $550.0 million for a forecasted debt issuance. As of August 31, 2016 and May 31, 2016, the the fair value of this treasury lock was $38.8 million and $19.6 million, respectively and is recorded in long-term liabilities and as a decrease to other comprehensive income, net of tax. The interest rate lock had no impact on net income or cash flows from continuing operations for the three months ending August 31, 2016.

Cintas has certain covenants related to debt agreements. These covenants limit Cintas’ ability to incur certain liens, to engage in sale-leaseback transactions and to merge, consolidate or sell all or substantially all of Cintas’ assets. These covenants also require Cintas to maintain certain debt to consolidated earnings before interest, taxes, depreciation and amortization (EBITDA) and interest coverage ratios. Cross-default provisions exist between certain debt instruments. If a default of a significant covenant were to occur, the default could result in an acceleration of the maturity of the indebtedness, impair liquidity and limit the ability to raise future capital. Cintas was in compliance with all debt covenants for all periods presented.

On August 15, 2016, the Company entered into the Agreement and Plan of Merger (Merger Agreement) pursuant to which the Company will acquire all outstanding shares of G&K Services, Inc (G&K Services) for $97.50 per share in cash, for a total enterprise value of approximately $2.2 billion, including acquired net debt. It is expected that this acquisition will be financed with short and long-term debt. To that end, the credit agreement that supports the commercial paper program was amended on September 16, 2016. The amendment increased the capacity of the revolving credit facility from $450.0 million to $600.0 million and added a $250.0 million term loan facility. The $150.0 million increase in the revolving credit facility will take effect on the earlier date of either the consummation of the merger (Merger) contemplated by the Merger Agreement among the Corporation, G&K Services and Bravo Merger Sub, Inc. (Merger Sub) a wholly-owned subsidiary of Cintas, dated as of August 15, 2016, or the date on which the Merger Agreement is validly terminated. The term loan facility shall be only funded upon the consummation of the Merger. The credit agreement has an accordion feature that provides Cintas the ability to request increases to the borrowing commitments under either the Revolving Credit Facility or the Term Loan Facility of up to $250.0 million in the aggregate, subject to customary conditions. The amendment also extended the maturity date of the agreement to September 15, 2021.