Supplemental Guarantor Information - Condensed Consolidating Balance Sheet (Details) (USD $)	Feb. 28, 2015	May 31, 2014	Feb. 28, 2014	Aug. 31, 2013	May 31, 2013
Current assets:
Cash and cash equivalents	$ 358,320,000	$ 513,288,000	$ 348,859,000	$ 348,859,000	$ 352,273,000
Marketable securities	44,874,000	0
Accounts receivable, net	497,978,000	508,427,000
Inventories, net	234,641,000	251,239,000
Uniforms and other rental items in service	524,065,000	506,537,000
Income taxes, current	6,633,000	0
Deferred tax asset (liability)	0
Assets held for sale	21,132,000	0
Prepaid expenses and other current assets	22,482,000	26,190,000
Total current assets	1,710,125,000	1,805,681,000
Property and equipment, at cost, net	853,391,000	855,702,000
Investments	445,538,000	458,357,000
Goodwill	1,194,389,000	1,267,411,000
Service contracts, net	44,824,000	55,675,000
Other assets, net	18,079,000	19,626,000
Total assets	4,266,346,000	4,462,452,000	4,400,441,000
Current liabilities:
Accounts payable	111,952,000	150,070,000
Accrued compensation and related liabilities	78,007,000	85,026,000
Accrued liabilities	281,872,000	299,727,000
Income taxes, current	0	5,960,000
Deferred tax liability	106,788,000	88,845,000
Liabilities held for sale	612,000	0
Long-term debt due within one year	0	503,000
Total current liabilities	579,231,000	630,131,000
Long-term liabilities:
Long-term debt due after one year	1,300,000,000	1,300,477,000
Deferred income taxes	232,232,000	246,044,000
Accrued liabilities	107,217,000	92,942,000
Total long-term liabilities	1,639,449,000	1,639,463,000
Total shareholders’ equity	2,047,666,000	2,192,858,000
Total liabilities and shareholders' equity	4,266,346,000	4,462,452,000
Cintas Corporation
Current assets:
Cash and cash equivalents	0	0		0	0
Marketable securities	0
Accounts receivable, net	0	0
Inventories, net	0	0
Uniforms and other rental items in service	0	0
Income taxes, current	0	0
Deferred tax asset (liability)	0
Assets held for sale	0
Prepaid expenses and other current assets	0	0
Total current assets	0	0
Property and equipment, at cost, net	0	0
Investments	321,083,000	321,083,000
Goodwill	0	0
Service contracts, net	0	0
Other assets, net	1,265,600,000	1,378,100,000
Total assets	1,586,683,000	1,699,183,000
Current liabilities:
Accounts payable	(465,246,000)	(465,247,000)
Accrued compensation and related liabilities	0	0
Accrued liabilities	0	0
Income taxes, current		0
Deferred tax liability	0	0
Liabilities held for sale	0
Long-term debt due within one year	0	0
Total current liabilities	(465,246,000)	(465,247,000)
Long-term liabilities:
Long-term debt due after one year	0	0
Deferred income taxes	0	0
Accrued liabilities	0	0
Total long-term liabilities	0	0
Total shareholders’ equity	2,051,929,000	2,164,430,000
Total liabilities and shareholders' equity	1,586,683,000	1,699,183,000
Corp. 2
Current assets:
Cash and cash equivalents	78,363,000	73,540,000		72,142,000	54,511,000
Marketable securities	0
Accounts receivable, net	360,585,000	366,629,000
Inventories, net	205,949,000	215,974,000
Uniforms and other rental items in service	389,894,000	374,666,000
Income taxes, current	(13,492,000)	1,549,000
Deferred tax asset (liability)	328,000
Assets held for sale	21,132,000
Prepaid expenses and other current assets	5,133,000	7,058,000
Total current assets	1,047,892,000	1,039,416,000
Property and equipment, at cost, net	514,102,000	533,665,000
Investments	2,073,181,000	2,081,094,000
Goodwill	0	0
Service contracts, net	44,785,000	51,248,000
Other assets, net	7,821,000	8,900,000
Total assets	3,687,781,000	3,714,323,000
Current liabilities:
Accounts payable	(727,330,000)	(545,526,000)
Accrued compensation and related liabilities	52,678,000	56,581,000
Accrued liabilities	50,457,000	79,614,000
Income taxes, current		0
Deferred tax liability	0	(510,000)
Liabilities held for sale	612,000
Long-term debt due within one year	293,000	773,000
Total current liabilities	(623,290,000)	(409,068,000)
Long-term liabilities:
Long-term debt due after one year	1,308,842,000	1,309,611,000
Deferred income taxes	(5,000)	(6,000)
Accrued liabilities	0	0
Total long-term liabilities	1,308,837,000	1,309,605,000
Total shareholders’ equity	3,002,234,000	2,813,786,000
Total liabilities and shareholders' equity	3,687,781,000	3,714,323,000
Subsidiary Guarantors
Current assets:
Cash and cash equivalents	221,365,000	399,525,000		238,629,000	247,070,000
Marketable securities	0
Accounts receivable, net	106,053,000	97,869,000
Inventories, net	16,385,000	20,745,000
Uniforms and other rental items in service	116,887,000	112,467,000
Income taxes, current	20,014,000	(1,549,000)
Deferred tax asset (liability)	(328,000)
Assets held for sale	0
Prepaid expenses and other current assets	16,212,000	14,752,000
Total current assets	496,588,000	643,809,000
Property and equipment, at cost, net	269,479,000	225,677,000
Investments	890,580,000	893,647,000
Goodwill	1,179,265,000	1,211,716,000
Service contracts, net	37,000	53,000
Other assets, net	2,504,120,000	2,189,527,000
Total assets	5,340,069,000	5,164,429,000
Current liabilities:
Accounts payable	1,241,536,000	1,092,545,000
Accrued compensation and related liabilities	21,373,000	22,590,000
Accrued liabilities	219,835,000	208,983,000
Income taxes, current		4,915,000
Deferred tax liability	98,990,000	80,575,000
Liabilities held for sale	0
Long-term debt due within one year	(293,000)	(270,000)
Total current liabilities	1,581,441,000	1,409,338,000
Long-term liabilities:
Long-term debt due after one year	(9,242,000)	(10,380,000)
Deferred income taxes	235,724,000	251,924,000
Accrued liabilities	106,301,000	92,069,000
Total long-term liabilities	332,783,000	333,613,000
Total shareholders’ equity	3,425,845,000	3,421,478,000
Total liabilities and shareholders' equity	5,340,069,000	5,164,429,000
Non- Guarantors
Current assets:
Cash and cash equivalents	58,592,000	40,223,000		38,088,000	50,692,000
Marketable securities	44,874,000
Accounts receivable, net	31,340,000	43,929,000
Inventories, net	9,635,000	9,650,000
Uniforms and other rental items in service	35,726,000	38,240,000
Income taxes, current	111,000	0
Deferred tax asset (liability)	0
Assets held for sale	0
Prepaid expenses and other current assets	1,137,000	4,380,000
Total current assets	181,415,000	136,422,000
Property and equipment, at cost, net	69,810,000	96,360,000
Investments	956,960,000	1,015,343,000
Goodwill	15,236,000	55,807,000
Service contracts, net	2,000	4,374,000
Other assets, net	8,632,000	9,044,000
Total assets	1,232,055,000	1,317,350,000
Current liabilities:
Accounts payable	24,969,000	30,281,000
Accrued compensation and related liabilities	3,956,000	5,855,000
Accrued liabilities	11,580,000	11,876,000
Income taxes, current		1,045,000
Deferred tax liability	7,798,000	8,780,000
Liabilities held for sale	0
Long-term debt due within one year	0	0
Total current liabilities	48,303,000	57,837,000
Long-term liabilities:
Long-term debt due after one year	400,000	500,000
Deferred income taxes	(3,487,000)	(5,874,000)
Accrued liabilities	916,000	873,000
Total long-term liabilities	(2,171,000)	(4,501,000)
Total shareholders’ equity	1,185,923,000	1,264,014,000
Total liabilities and shareholders' equity	1,232,055,000	1,317,350,000
Eliminations
Current assets:
Cash and cash equivalents	0	0		0	0
Marketable securities	0
Accounts receivable, net	0	0
Inventories, net	2,672,000	4,870,000
Uniforms and other rental items in service	(18,442,000)	(18,836,000)
Income taxes, current	0	0
Deferred tax asset (liability)	0
Assets held for sale	0
Prepaid expenses and other current assets	0	0
Total current assets	(15,770,000)	(13,966,000)
Property and equipment, at cost, net	0	0
Investments	(3,796,266,000)	(3,852,810,000)
Goodwill	(112,000)	(112,000)
Service contracts, net	0	0
Other assets, net	(3,768,094,000)	(3,565,945,000)
Total assets	(7,580,242,000)	(7,432,833,000)
Current liabilities:
Accounts payable	38,023,000	38,017,000
Accrued compensation and related liabilities	0	0
Accrued liabilities	0	(746,000)
Income taxes, current		0
Deferred tax liability	0	0
Liabilities held for sale	0
Long-term debt due within one year	0	0
Total current liabilities	38,023,000	37,271,000
Long-term liabilities:
Long-term debt due after one year	0	746,000
Deferred income taxes	0	0
Accrued liabilities	0	0
Total long-term liabilities	0	746,000
Total shareholders’ equity	(7,618,265,000)	(7,470,850,000)
Total liabilities and shareholders' equity	$ (7,580,242,000)	$ (7,432,833,000)