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Supplemental Guarantor Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Aug. 31, 2010 | May 31, 2012 | May 31, 2011 | May 31, 2010
Revenue: |  |  |  |  |  |  |  |  |  |  |
Rental uniforms and ancillary products |  |  |  |  |  |  |  |  | $ 2,912,261 | $ 2,692,248 | $ 2,569,357
Other services |  |  |  |  |  |  |  |  | 1,189,739 | 1,118,136 | 977,982
Equity in net income of affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue | 1,053,582 | 1,012,112 | 1,019,126 | 1,017,180 | 1,012,087 | 937,827 | 936,566 | 923,904 | 4,102,000 | 3,810,384 | 3,547,339
Costs and expenses (income): |  |  |  |  |  |  |  |  |  |  |
Cost of rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 1,648,551 | 1,530,456 | 1,449,576
Cost of other services |  |  |  |  |  |  |  |  | 714,841 | 670,641 | 599,946
Selling and administrative expenses |  |  |  |  |  |  |  |  | 1,198,981 | 1,168,944 | 1,086,359
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  | 0 | 0 | 23,529
Restructuring credits |  |  |  |  |  |  |  |  | 0 | 0 | (2,880)
Operating income |  |  |  |  |  |  |  |  | 539,627 | 440,343 | 390,809
Interest income |  |  |  |  |  |  |  |  | (1,942) | (2,030) | (1,695)
Interest expense (income) |  |  |  |  |  |  |  |  | 70,625 | 49,704 | 48,612
Income before income taxes |  |  |  |  |  |  |  |  | 470,944 | 392,669 | 343,892
Income taxes |  |  |  |  |  |  |  |  | 173,307 | 145,680 | 128,272
Net income | 78,614 | 76,035 | 74,350 | 68,638 | 70,776 | 59,070 | 55,866 | 61,277 | 297,637 | 246,989 | 215,620
Cintas Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other services |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in net income of affiliates |  |  |  |  |  |  |  |  | 297,637 | 246,989 | 215,620
Total revenue |  |  |  |  |  |  |  |  | 297,637 | 246,989 | 215,620
Costs and expenses (income): |  |  |  |  |  |  |  |  |  |  |
Cost of rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of other services |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0
Restructuring credits |  |  |  |  |  |  |  |  |  |  | 0
Operating income |  |  |  |  |  |  |  |  | 297,637 | 246,989 | 215,620
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense (income) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 297,637 | 246,989 | 215,620
Income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 297,637 | 246,989 | 215,620
Corp. 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 2,233,085 | 2,069,895 | 1,970,303
Other services |  |  |  |  |  |  |  |  | 1,488,163 | 1,395,119 | 1,216,779
Equity in net income of affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 3,721,248 | 3,465,014 | 3,187,082
Costs and expenses (income): |  |  |  |  |  |  |  |  |  |  |
Cost of rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 1,386,320 | 1,305,908 | 1,226,076
Cost of other services |  |  |  |  |  |  |  |  | 955,148 | 876,359 | 798,841
Selling and administrative expenses |  |  |  |  |  |  |  |  | 1,184,888 | 1,065,037 | 1,037,945
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0
Restructuring credits |  |  |  |  |  |  |  |  |  |  | (1,080)
Operating income |  |  |  |  |  |  |  |  | 194,892 | 217,710 | 125,300
Interest income |  |  |  |  |  |  |  |  | (111,631) | (589) | (268)
Interest expense (income) |  |  |  |  |  |  |  |  | 72,212 | 52,357 | 51,486
Income before income taxes |  |  |  |  |  |  |  |  | 234,311 | 165,942 | 74,082
Income taxes |  |  |  |  |  |  |  |  | 68,752 | 60,028 | 27,936
Net income |  |  |  |  |  |  |  |  | 165,559 | 105,914 | 46,146
Subsidiary Guarantors [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 574,950 | 531,525 | 518,254
Other services |  |  |  |  |  |  |  |  | 28,660 | 340,063 | 351,368
Equity in net income of affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 603,610 | 871,588 | 869,622
Costs and expenses (income): |  |  |  |  |  |  |  |  |  |  |
Cost of rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 362,803 | 330,442 | 332,935
Cost of other services |  |  |  |  |  |  |  |  | (13,649) | 316,650 | 297,890
Selling and administrative expenses |  |  |  |  |  |  |  |  | (69,882) | 17,270 | (20,140)
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 23,529
Restructuring credits |  |  |  |  |  |  |  |  |  |  | (1,800)
Operating income |  |  |  |  |  |  |  |  | 324,338 | 207,226 | 237,208
Interest income |  |  |  |  |  |  |  |  | (589) | (697) | (1,130)
Interest expense (income) |  |  |  |  |  |  |  |  | (1,543) | (2,687) | (2,897)
Income before income taxes |  |  |  |  |  |  |  |  | 326,470 | 210,610 | 241,235
Income taxes |  |  |  |  |  |  |  |  | 95,793 | 76,186 | 91,239
Net income |  |  |  |  |  |  |  |  | 230,677 | 134,424 | 149,996
Non-Guarantors [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 210,683 | 196,380 | 180,847
Other services |  |  |  |  |  |  |  |  | 117,791 | 109,634 | 66,229
Equity in net income of affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 328,474 | 306,014 | 247,076
Costs and expenses (income): |  |  |  |  |  |  |  |  |  |  |
Cost of rental uniforms and ancillary products |  |  |  |  |  |  |  |  | 145,293 | 132,463 | 111,340
Cost of other services |  |  |  |  |  |  |  |  | 73,130 | 67,997 | 41,316
Selling and administrative expenses |  |  |  |  |  |  |  |  | (145,953) | 92,839 | 67,669
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0
Restructuring credits |  |  |  |  |  |  |  |  |  |  | 0
Operating income |  |  |  |  |  |  |  |  | 256,004 | 12,715 | 26,751
Interest income |  |  |  |  |  |  |  |  | (190,345) | (100,777) | (297)
Interest expense (income) |  |  |  |  |  |  |  |  | (44) | 34 | 23
Income before income taxes |  |  |  |  |  |  |  |  | 446,393 | 113,458 | 27,025
Income taxes |  |  |  |  |  |  |  |  | 8,814 | 9,494 | 9,123
Net income |  |  |  |  |  |  |  |  | 437,579 | 103,964 | 17,902
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Rental uniforms and ancillary products |  |  |  |  |  |  |  |  | (106,457) | (105,552) | (100,047)
Other services |  |  |  |  |  |  |  |  | (444,875) | (726,680) | (656,394)
Equity in net income of affiliates |  |  |  |  |  |  |  |  | (297,637) | (246,989) | (215,620)
Total revenue |  |  |  |  |  |  |  |  | (848,969) | (1,079,221) | (972,061)
Costs and expenses (income): |  |  |  |  |  |  |  |  |  |  |
Cost of rental uniforms and ancillary products |  |  |  |  |  |  |  |  | (245,865) | (238,357) | (220,775)
Cost of other services |  |  |  |  |  |  |  |  | (299,788) | (590,365) | (538,101)
Selling and administrative expenses |  |  |  |  |  |  |  |  | 229,928 | (6,202) | 885
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0
Restructuring credits |  |  |  |  |  |  |  |  |  |  | 0
Operating income |  |  |  |  |  |  |  |  | (533,244) | (244,297) | (214,070)
Interest income |  |  |  |  |  |  |  |  | 300,623 | 100,033 | 0
Interest expense (income) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | (833,867) | (344,330) | (214,070)
Income taxes |  |  |  |  |  |  |  |  | (52) | (28) | (26)
Net income |  |  |  |  |  |  |  |  | $ (833,815) | $ (344,302) | $ (214,044)

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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311 + Details
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