Supplemental Guarantor Information (Condensed Consolidated Statements of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Condensed Consolidating Financial Statements
Net income	$ 110,108	$ 77,754
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(2,115)	(646)
Change in fair value of derivatives	17	0
Amortization of interest rate lock agreements	488	488
Change in fair value of available-for-sale securities	0	(14)
Other comprehensive loss	(1,610)	(172)
Comprehensive income	108,498	77,582
Cintas Corporation
Condensed Consolidating Financial Statements
Net income	110,108	77,754
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	110,108	77,754
Corp. 2
Condensed Consolidating Financial Statements
Net income	33,150	25,681
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0	7
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	495
Comprehensive income	33,638	26,176
Subsidiary Guarantors
Condensed Consolidating Financial Statements
Net income	75,016	50,957
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		(13)
Other comprehensive loss	0	(13)
Comprehensive income	75,016	50,944
Non-Guarantors
Condensed Consolidating Financial Statements
Net income	3,177	16,394
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(2,115)	(653)
Change in fair value of derivatives	17
Amortization of interest rate lock agreements	0	0
Change in fair value of available-for-sale securities		(1)
Other comprehensive loss	(2,098)	(654)
Comprehensive income	1,079	15,740
Eliminations
Condensed Consolidating Financial Statements
Net income	(111,343)	(93,032)
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	$ (111,343)	$ (93,032)