Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Condensed Consolidating Financial Statements
Net income	$ 100,181	$ 110,108
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(12,013)	(2,115)
Change in fair value of derivatives	0	17
Amortization of interest rate lock agreements	488	488
Change in fair value of available-for-sale securities	(8)	0
Other comprehensive loss	(11,533)	(1,610)
Comprehensive income	88,648	108,498
Cintas Corporation
Condensed Consolidating Financial Statements
Net income	100,181	110,108
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0	0
Change in fair value of derivatives		0
Amortization of interest rate lock agreements	0	0
Change in fair value of available-for-sale securities	0
Other comprehensive loss	0	0
Comprehensive income	100,181	110,108
Corp. 2
Condensed Consolidating Financial Statements
Net income	27,628	33,150
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0	0
Change in fair value of derivatives		0
Amortization of interest rate lock agreements	488	488
Change in fair value of available-for-sale securities	0
Other comprehensive loss	488	488
Comprehensive income	28,116	33,638
Subsidiary Guarantors
Condensed Consolidating Financial Statements
Net income	71,643	75,016
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0	0
Change in fair value of derivatives		0
Amortization of interest rate lock agreements	0	0
Change in fair value of available-for-sale securities	0
Other comprehensive loss	0	0
Comprehensive income	71,643	75,016
Non- Guarantors
Condensed Consolidating Financial Statements
Net income	2,533	3,177
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(12,013)	(2,115)
Change in fair value of derivatives		17
Amortization of interest rate lock agreements	0	0
Change in fair value of available-for-sale securities	(8)
Other comprehensive loss	(12,021)	(2,098)
Comprehensive income	(9,488)	1,079
Eliminations
Condensed Consolidating Financial Statements
Net income	(101,804)	(111,343)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0	0
Change in fair value of derivatives		0
Amortization of interest rate lock agreements	0	0
Change in fair value of available-for-sale securities	0
Other comprehensive loss	0	0
Comprehensive income	$ (101,804)	$ (111,343)