Supplemental Guarantor Information - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Revenue:
Revenue	$ 1,811,139	$ 1,697,975
Equity in net income of affiliates	0	0
Total revenue	1,811,139	1,697,975
Costs and expenses (income):
Selling and administrative expenses	542,996	504,634
G&K Services, Inc. integration expenses	0	4,850
Operating income	306,146	265,228
Interest (income) expense	(162)	(496)
Interest expense (income)	27,321	24,304
Income before income taxes	278,987	241,420
Income taxes	28,175	28,873
Income from continuing operations	250,812	212,547
Income from discontinued operations, net of tax	0	(32)
Net income	250,812	212,515
Eliminations
Revenue:
Equity in net income of affiliates	(250,812)	(212,547)
Total revenue	(501,012)	(452,212)
Costs and expenses (income):
Selling and administrative expenses	(6,604)	(10,018)
G&K Services, Inc. integration expenses		0
Operating income	(258,689)	(210,707)
Interest (income) expense	1	1
Interest expense (income)	0	0
Income before income taxes	(258,690)	(210,708)
Income taxes	(25)	(21)
Income from continuing operations	(258,665)	(210,687)
Income from discontinued operations, net of tax		32
Net income	(258,665)	(210,655)
Cintas Corporation | Reportable Legal Entities
Revenue:
Equity in net income of affiliates	250,812	212,547
Total revenue	250,812	212,547
Costs and expenses (income):
Selling and administrative expenses	0	0
G&K Services, Inc. integration expenses		0
Operating income	250,812	212,547
Interest (income) expense	0	0
Interest expense (income)	0	0
Income before income taxes	250,812	212,547
Income taxes	0	0
Income from continuing operations	250,812	212,547
Income from discontinued operations, net of tax		(32)
Net income	250,812	212,515
Corp. 2 | Reportable Legal Entities
Revenue:
Equity in net income of affiliates	0	0
Total revenue	1,741,867	1,630,419
Costs and expenses (income):
Selling and administrative expenses	599,403	544,910
G&K Services, Inc. integration expenses		2,676
Operating income	117,099	97,759
Interest (income) expense	(150)	(209)
Interest expense (income)	27,360	24,661
Income before income taxes	89,889	73,307
Income taxes	8,201	10,663
Income from continuing operations	81,688	62,644
Income from discontinued operations, net of tax		(32)
Net income	81,688	62,612
Subsidiary Guarantors | Reportable Legal Entities
Revenue:
Equity in net income of affiliates	0	0
Total revenue	190,832	183,206
Costs and expenses (income):
Selling and administrative expenses	(84,257)	(64,621)
G&K Services, Inc. integration expenses		1,863
Operating income	186,032	158,443
Interest (income) expense	1	(272)
Interest expense (income)	(53)	(362)
Income before income taxes	186,084	159,077
Income taxes	16,978	16,044
Income from continuing operations	169,106	143,033
Income from discontinued operations, net of tax		0
Net income	169,106	143,033
Non- Guarantors | Reportable Legal Entities
Revenue:
Equity in net income of affiliates	0	0
Total revenue	128,640	124,015
Costs and expenses (income):
Selling and administrative expenses	34,454	34,363
G&K Services, Inc. integration expenses		311
Operating income	10,892	7,186
Interest (income) expense	(14)	(16)
Interest expense (income)	14	5
Income before income taxes	10,892	7,197
Income taxes	3,021	2,187
Income from continuing operations	7,871	5,010
Income from discontinued operations, net of tax		0
Net income	7,871	5,010
Uniform Rental and Facility Services
Revenue:
Revenue	1,454,527	1,374,938
Cost of revenue	768,676	746,453
Uniform Rental and Facility Services | Eliminations
Revenue:
Revenue	(493)	(47,037)
Cost of revenue	(30,534)	(70,851)
Uniform Rental and Facility Services | Cintas Corporation | Reportable Legal Entities
Revenue:
Revenue	0	0
Cost of revenue	0	0
Uniform Rental and Facility Services | Corp. 2 | Reportable Legal Entities
Revenue:
Revenue	1,158,891	1,139,129
Cost of revenue	621,881	643,741
Uniform Rental and Facility Services | Subsidiary Guarantors | Reportable Legal Entities
Revenue:
Revenue	190,735	183,163
Cost of revenue	111,734	109,550
Uniform Rental and Facility Services | Non- Guarantors | Reportable Legal Entities
Revenue:
Revenue	105,394	99,683
Cost of revenue	65,595	64,013
Other
Revenue:
Revenue	356,612	323,037
Cost of revenue	193,321	176,810
Other | Eliminations
Revenue:
Revenue	(249,707)	(192,628)
Cost of revenue	(205,185)	(160,636)
Other | Cintas Corporation | Reportable Legal Entities
Revenue:
Revenue	0	0
Cost of revenue	0	0
Other | Corp. 2 | Reportable Legal Entities
Revenue:
Revenue	582,976	491,290
Cost of revenue	403,484	341,333
Other | Subsidiary Guarantors | Reportable Legal Entities
Revenue:
Revenue	97	43
Cost of revenue	(22,677)	(22,029)
Other | Non- Guarantors | Reportable Legal Entities
Revenue:
Revenue	23,246	24,332
Cost of revenue	$ 17,699	$ 18,142