Supplemental Guarantor Information (Condensed Consolidated Statements of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	May 31, 2014		Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2014	May 31, 2013	May 31, 2012
Condensed Consolidating Financial Statements
Net income	$ 127,224	[1]	$ 84,602	$ 84,862	$ 77,754	$ 85,977	$ 74,705	$ 78,027	$ 76,733	$ 374,442	$ 315,442	$ 297,637
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments										(9,787)	(1,087)	(17,815)
Change in fair value of derivatives										(228)	(187)	(5,286)
Amortization of interest rate lock agreements										1,952	1,952	1,508
Other										(1,632)	782	(551)
Other comprehensive (loss) income										(9,695)	1,460	(22,144)
Comprehensive income										364,747	316,902	275,493
Cintas Corporation [Member]
Condensed Consolidating Financial Statements
Net income										374,442	315,442	297,637
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments										0	0	0
Change in fair value of derivatives										0	0	0
Amortization of interest rate lock agreements										0	0	0
Other										0	0	0
Other comprehensive (loss) income										0	0	0
Comprehensive income										374,442	315,442	297,637
Corp. 2 [Member]
Condensed Consolidating Financial Statements
Net income										162,263	98,748	165,559
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments										0	(12)	(18)
Change in fair value of derivatives										0	(187)	(5,604)
Amortization of interest rate lock agreements										1,952	1,952	1,508
Other										0	0	0
Other comprehensive (loss) income										1,952	1,753	(4,114)
Comprehensive income										164,215	100,501	161,445
Subsidiary Guarantors [Member]
Condensed Consolidating Financial Statements
Net income										205,009	216,727	230,677
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments										0	0	0
Change in fair value of derivatives										0	0	0
Amortization of interest rate lock agreements										0	0	0
Other										(1,629)	782	(575)
Other comprehensive (loss) income										(1,629)	782	(575)
Comprehensive income										203,380	217,509	230,102
Non-Guarantors [Member]
Condensed Consolidating Financial Statements
Net income										20,809	32,793	437,579
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments										(9,787)	(1,075)	(17,797)
Change in fair value of derivatives										(228)	0	318
Amortization of interest rate lock agreements										0	0	0
Other										(3)	0	24
Other comprehensive (loss) income										(10,018)	(1,075)	(17,455)
Comprehensive income										10,791	31,718	420,124
Eliminations [Member]
Condensed Consolidating Financial Statements
Net income										(388,081)	(348,268)	(833,815)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments										0	0	0
Change in fair value of derivatives										0	0	0
Amortization of interest rate lock agreements										0	0	0
Other										0	0	0
Other comprehensive (loss) income										0	0	0
Comprehensive income										$ (388,081)	$ (348,268)	$ (833,815)

[1] On April 30, 2014, Cintas completed its previously announced partnership transaction with the shareholders of Shred-it to combine Cintas’ document destruction business with Shred-it’s document destruction business. Under the agreement, Cintas and Shred-it each contributed its document destruction business to a newly formed partnership owned 42% by Cintas and 58% by the shareholders of Shred-it. The deconsolidation of the document destruction business negatively impacted fiscal 2014 fourth quarter revenue. In the fourth quarter of fiscal 2014, the Company realized a $106.4 million gain on deconsolidation of the shredding business. In addition, as a result of the shredding transaction, the Company recorded an asset impairment charge of $16.1 million in the fourth quarter of fiscal 2014. The Company also recorded transaction costs of $28.5 million, of which $2.2 million was recorded in the third quarter and $26.3 million was recorded in the fourth quarter. Please see Note 9 entitled Acquisitions and Deconsolidation for additional information on the transaction.