Supplemental Guarantor Information (Condensed Consolidating Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Revenue:
Rental uniforms and ancillary products	$ 804,316	$ 755,839	$ 1,597,182	$ 1,510,682
Other services	339,437	304,547	666,914	601,029
Equity in net income of affiliates	0	0	0	0
Total revenue	1,143,753	1,060,386	2,264,096	2,111,711
Costs and expenses (income):
Cost of rental uniforms and ancillary products	459,112	438,902	913,843	867,050
Cost of other services	207,722	189,448	407,354	366,750
Selling and administrative expenses	323,947	293,013	649,857	599,594
Operating income	152,972	139,023	293,042	278,317
Interest income	(84)	(149)	(152)	(226)
Interest expense	16,485	16,294	33,008	32,892
Income before income taxes	136,571	122,878	260,186	245,651
Income taxes	51,709	44,851	97,570	90,891
Net income	84,862	78,027	162,616	154,760
Cintas Corporation
Revenue:
Rental uniforms and ancillary products	0	0	0	0
Other services	0	0	0	0
Equity in net income of affiliates	84,862	78,027	162,616	154,760
Total revenue	84,862	78,027	162,616	154,760
Costs and expenses (income):
Cost of rental uniforms and ancillary products	0	0	0	0
Cost of other services	0	0	0	0
Selling and administrative expenses	0	0	0	0
Operating income	84,862	78,027	162,616	154,760
Interest income	0	0	0	0
Interest expense	0	0	0	0
Income before income taxes	84,862	78,027	162,616	154,760
Income taxes	0	0	0	0
Net income	84,862	78,027	162,616	154,760
Corp. 2
Revenue:
Rental uniforms and ancillary products	614,742	575,274	1,220,500	1,151,559
Other services	419,533	387,265	824,107	756,671
Equity in net income of affiliates	0	0	0	0
Total revenue	1,034,275	962,539	2,044,607	1,908,230
Costs and expenses (income):
Cost of rental uniforms and ancillary products	390,215	367,645	773,934	731,842
Cost of other services	272,410	256,524	533,005	492,855
Selling and administrative expenses	314,421	280,259	623,182	570,903
Operating income	57,229	58,111	114,486	112,630
Interest income	(11)	(13)	(19)	(31)
Interest expense	16,468	16,277	32,948	32,843
Income before income taxes	40,772	41,847	81,557	79,818
Income taxes	15,500	14,876	30,604	29,255
Net income	25,272	26,971	50,953	50,563
Subsidiary Guarantors
Revenue:
Rental uniforms and ancillary products	164,985	152,771	327,550	305,588
Other services	9,166	10,630	17,714	21,509
Equity in net income of affiliates	0	0	0	0
Total revenue	174,151	163,401	345,264	327,097
Costs and expenses (income):
Cost of rental uniforms and ancillary products	96,831	95,014	194,998	184,356
Cost of other services	(3,091)	(6,949)	(6,202)	(9,366)
Selling and administrative expenses	(10,965)	(7,023)	(15,824)	(11,162)
Operating income	91,376	82,359	172,292	163,269
Interest income	(72)	(126)	(125)	(161)
Interest expense	17	18	61	49
Income before income taxes	91,431	82,467	172,356	163,381
Income taxes	34,709	29,241	64,677	59,883
Net income	56,722	53,226	107,679	103,498
Non-Guarantors
Revenue:
Rental uniforms and ancillary products	56,104	55,370	111,069	109,154
Other services	34,784	28,964	66,170	58,342
Equity in net income of affiliates	0	0	0	0
Total revenue	90,888	84,334	177,239	167,496
Costs and expenses (income):
Cost of rental uniforms and ancillary products	39,465	38,923	78,021	75,543
Cost of other services	21,156	18,564	40,220	36,272
Selling and administrative expenses	25,483	23,705	51,696	48,006
Operating income	4,784	3,142	7,302	7,675
Interest income	(2)	(10)	(14,696)	(34)
Interest expense	0	(1)	(1)	0
Income before income taxes	4,786	3,153	21,999	7,709
Income taxes	1,514	746	2,333	1,770
Net income	3,272	2,407	19,666	5,939
Eliminations
Revenue:
Rental uniforms and ancillary products	(31,515)	(27,576)	(61,937)	(55,619)
Other services	(124,046)	(122,312)	(241,077)	(235,493)
Equity in net income of affiliates	(84,862)	(78,027)	(162,616)	(154,760)
Total revenue	(240,423)	(227,915)	(465,630)	(445,872)
Costs and expenses (income):
Cost of rental uniforms and ancillary products	(67,399)	(62,680)	(133,110)	(124,691)
Cost of other services	(82,753)	(78,691)	(159,669)	(153,011)
Selling and administrative expenses	(4,992)	(3,928)	(9,197)	(8,153)
Operating income	(85,279)	(82,616)	(163,654)	(160,017)
Interest income	1	0	14,688	0
Interest expense	0	0	0	0
Income before income taxes	(85,280)	(82,616)	(178,342)	(160,017)
Income taxes	(14)	(12)	(44)	(17)
Net income	$ (85,266)	$ (82,604)	$ (178,298)	$ (160,000)