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Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Details) (USD $) | 12 Months Ended
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May 31, 2013 | May 31, 2012 | May 31, 2011
Cash flows from operating activities: |  |  |
Net income | $ 315,442,000 | $ 297,637,000 | $ 246,989,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation | 165,664,000 | 155,831,000 | 150,886,000
Amortization of intangible assets | 23,713,000 | 38,334,000 | 42,581,000
Stock-based compensation | 23,310,000 | 20,312,000 | 15,203,000
Deferred income taxes | 48,023,000 | 56,727,000 | 47,908,000
Change in current assets and liabilities, net of acquisitions of businesses: |  |  |
Accounts receivable, net | (42,704,000) | (24,261,000) | (48,986,000)
Inventories, net | 10,997,000 | (2,330,000) | (78,824,000)
Uniforms and other rental items in service | (44,179,000) | (60,279,000) | (58,180,000)
Prepaid expenses | (3,281,000) | (1,496,000) | 360,000
Accounts payable | 25,023,000 | (12,557,000) | 29,215,000
Accrued compensation and related liabilities | (13,161,000) | 11,625,000 | 12,493,000
Accrued liabilities | 31,873,000 | (20,371,000) | (2,167,000)
Income taxes, current | 12,028,000 | 10,690,000 | (16,592,000)
Net cash provided by operating activities | 552,748,000 | 469,862,000 | 340,886,000
Cash flows from investing activities: |  |  |
Capital expenditures | (196,486,000) | (160,802,000) | (182,592,000)
Proceeds from redemption of marketable securities | 161,478,000 | 665,016,000 | 139,056,000
Purchase of marketable securities and investments | (178,464,000) | (585,655,000) | (78,307,000)
Acquisitions of businesses, net of cash acquired | (69,370,000) | (24,864,000) | (171,552,000)
Other | (1,339,000) | 2,011,000 | (5,198,000)
Net cash used in investing activities | (284,181,000) | (104,294,000) | (298,593,000)
Cash flows from financing activities: |  |  |
Proceeds from issuance of debt | 250,000,000 | 0 | 1,002,281,000
Repayment of debt | (225,636,000) | (1,323,000) | (502,208,000)
Proceeds from exercise of stock-based compensation awards | 14,807,000 | 3,341,000 | 0
Dividends paid | (79,744,000) | (70,820,000) | (71,812,000)
Repurchase of common stock | (215,681,000) | (392,328,000) | (443,690,000)
Other | 196,000 | 555,000 | (4,609,000)
Net cash used in financing activities | (256,058,000) | (460,575,000) | (20,038,000)
Effect of exchange rate changes on cash and cash equivalents | (61,000) | (3,274,000) | 4,570,000
Net increase (decrease) in cash and cash equivalents | 12,448,000 | (98,281,000) | 26,825,000
Cash and cash equivalents at beginning of year | 339,825,000 | 438,106,000 | 411,281,000
Cash and cash equivalents at end of year | 352,273,000 | 339,825,000 | 438,106,000
Cintas Corporation [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 315,442,000 | 297,637,000 | 246,989,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation | 0 | 0 | 0
Amortization of intangible assets | 0 | 0 | 0
Stock-based compensation | 23,310,000 | 20,312,000 | 15,203,000
Deferred income taxes | 0 | 0 | 0
Change in current assets and liabilities, net of acquisitions of businesses: |  |  |
Accounts receivable, net | 0 | 0 | 0
Inventories, net | 0 | 0 | 0
Uniforms and other rental items in service | 0 | 0 | 0
Prepaid expenses | 0 | 0 | 0
Accounts payable | 0 | 0 | 0
Accrued compensation and related liabilities | 0 | 0 | 0
Accrued liabilities | 0 | 0 | 0
Income taxes, current | 0 | 0 | 0
Net cash provided by operating activities | 338,752,000 | 317,949,000 | 262,192,000
Cash flows from investing activities: |  |  |
Capital expenditures | 0 | 0 | 0
Proceeds from redemption of marketable securities | 0 | 0 | 0
Purchase of marketable securities and investments | 0 | 0 | 0
Acquisitions of businesses, net of cash acquired | 0 | 0 | 0
Other | (60,918,000) | 141,350,000 | 253,387,000
Net cash used in investing activities | (60,918,000) | 141,350,000 | 253,387,000
Cash flows from financing activities: |  |  |
Proceeds from issuance of debt | 0 | 0 | 0
Repayment of debt | 0 | 0 | 0
Proceeds from exercise of stock-based compensation awards | 14,807,000 | 3,341,000 |
Dividends paid | (79,723,000) | (70,800,000) | (71,801,000)
Repurchase of common stock | (215,681,000) | (392,328,000) | (443,690,000)
Other | 2,763,000 | 488,000 | (88,000)
Net cash used in financing activities | (277,834,000) | (459,299,000) | (515,579,000)
Effect of exchange rate changes on cash and cash equivalents | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents at beginning of year | 0 | 0 | 0
Cash and cash equivalents at end of year | 0 | 0 | 0
Corp. 2 [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 98,748,000 | 165,559,000 | 105,914,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation | 16,647,000 | 102,613,000 | 103,039,000
Amortization of intangible assets | 21,077,000 | 33,114,000 | 37,615,000
Stock-based compensation | 0 | 0 | 0
Deferred income taxes | 0 | 0 | (4,886,000)
Change in current assets and liabilities, net of acquisitions of businesses: |  |  |
Accounts receivable, net | (25,206,000) | (15,280,000) | (39,060,000)
Inventories, net | 9,034,000 | (5,635,000) | (59,223,000)
Uniforms and other rental items in service | (26,364,000) | (34,401,000) | (45,149,000)
Prepaid expenses | 507,000 | (2,154,000) | 223,000
Accounts payable | (55,802,000) | (143,189,000) | (392,210,000)
Accrued compensation and related liabilities | (9,206,000) | 8,659,000 | 12,957,000
Accrued liabilities | (5,416,000) | 16,929,000 | (2,740,000)
Income taxes, current | 1,110,000 | (4,357,000) | 4,265,000
Net cash provided by operating activities | 25,129,000 | 121,858,000 | (279,255,000)
Cash flows from investing activities: |  |  |
Capital expenditures | (39,975,000) | (116,954,000) | (99,739,000)
Proceeds from redemption of marketable securities | 0 | 0 | 0
Purchase of marketable securities and investments | (683,000) | (2,740,000) | (16,897,000)
Acquisitions of businesses, net of cash acquired | (67,431,000) | (19,323,000) | (133,378,000)
Other | 58,589,000 | 20,090,000 | 54,296,000
Net cash used in investing activities | (49,500,000) | (118,927,000) | (195,718,000)
Cash flows from financing activities: |  |  |
Proceeds from issuance of debt | 250,000,000 | 0 | 1,000,500,000
Repayment of debt | (225,866,000) | (843,000) | (501,316,000)
Proceeds from exercise of stock-based compensation awards | 0 | 0 |
Dividends paid | 0 | 0 | 0
Repurchase of common stock | 0 | 0 | 0
Other | (3,989,000) | 1,508,000 | (4,576,000)
Net cash used in financing activities | 20,145,000 | 665,000 | 494,608,000
Effect of exchange rate changes on cash and cash equivalents | 0 | 184,000 | 417,000
Net increase (decrease) in cash and cash equivalents | (4,226,000) | 3,780,000 | 20,052,000
Cash and cash equivalents at beginning of year | 58,737,000 | 54,957,000 | 34,905,000
Cash and cash equivalents at end of year | 54,511,000 | 58,737,000 | 54,957,000
Subsidiary Guarantors [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 216,727,000 | 230,677,000 | 134,424,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation | 135,345,000 | 40,613,000 | 36,032,000
Amortization of intangible assets | 200,000 | 393,000 | 543,000
Stock-based compensation | 0 | 0 | 0
Deferred income taxes | 53,916,000 | 56,411,000 | 51,996,000
Change in current assets and liabilities, net of acquisitions of businesses: |  |  |
Accounts receivable, net | (15,326,000) | (4,985,000) | (2,079,000)
Inventories, net | (5,292,000) | 4,685,000 | (8,112,000)
Uniforms and other rental items in service | (11,590,000) | (19,286,000) | (11,671,000)
Prepaid expenses | (3,620,000) | 950,000 | 2,085,000
Accounts payable | 75,034,000 | 661,243,000 | 393,185,000
Accrued compensation and related liabilities | (3,977,000) | 1,466,000 | (1,577,000)
Accrued liabilities | 38,099,000 | (30,586,000) | (6,318,000)
Income taxes, current | 206,000 | 4,712,000 | (8,858,000)
Net cash provided by operating activities | 479,722,000 | 946,293,000 | 579,650,000
Cash flows from investing activities: |  |  |
Capital expenditures | (131,208,000) | (26,270,000) | (68,274,000)
Proceeds from redemption of marketable securities | 13,899,000 | 0 | 23,206,000
Purchase of marketable securities and investments | (31,075,000) | (416,100,000) | (55,438,000)
Acquisitions of businesses, net of cash acquired | 112,000 | (65,000) | (1,831,000)
Other | (315,519,000) | (588,518,000) | (504,637,000)
Net cash used in investing activities | (463,791,000) | (1,030,953,000) | (606,974,000)
Cash flows from financing activities: |  |  |
Proceeds from issuance of debt | 638,000 | (786,000) | 1,781,000
Repayment of debt | 445,000 | 324,000 | (876,000)
Proceeds from exercise of stock-based compensation awards | 0 | 0 |
Dividends paid | 0 | 0 | 0
Repurchase of common stock | 0 | 0 | 0
Other | 769,000 | (574,000) | 0
Net cash used in financing activities | 1,852,000 | (1,036,000) | 905,000
Effect of exchange rate changes on cash and cash equivalents | 0 | 1,700,000 | 0
Net increase (decrease) in cash and cash equivalents | 17,783,000 | (83,996,000) | (26,419,000)
Cash and cash equivalents at beginning of year | 229,287,000 | 313,283,000 | 339,702,000
Cash and cash equivalents at end of year | 247,070,000 | 229,287,000 | 313,283,000
Non-Guarantors [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 32,793,000 | 437,579,000 | 103,964,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation | 13,672,000 | 12,605,000 | 11,815,000
Amortization of intangible assets | 2,436,000 | 4,827,000 | 4,423,000
Stock-based compensation | 0 | 0 | 0
Deferred income taxes | (5,893,000) | 316,000 | 798,000
Change in current assets and liabilities, net of acquisitions of businesses: |  |  |
Accounts receivable, net | (2,172,000) | (3,996,000) | (7,847,000)
Inventories, net | 626,000 | 1,590,000 | (2,957,000)
Uniforms and other rental items in service | (4,077,000) | (1,477,000) | (7,179,000)
Prepaid expenses | (168,000) | (292,000) | (1,948,000)
Accounts payable | 5,794,000 | (530,611,000) | 28,244,000
Accrued compensation and related liabilities | 22,000 | 1,500,000 | 1,113,000
Accrued liabilities | (829,000) | (6,732,000) | 6,875,000
Income taxes, current | 10,712,000 | 10,335,000 | (11,999,000)
Net cash provided by operating activities | 52,916,000 | (74,356,000) | 125,302,000
Cash flows from investing activities: |  |  |
Capital expenditures | (25,303,000) | (17,578,000) | (14,579,000)
Proceeds from redemption of marketable securities | 147,579,000 | 665,016,000 | 115,850,000
Purchase of marketable securities and investments | (158,378,000) | (579,654,000) | (61,438,000)
Acquisitions of businesses, net of cash acquired | (2,051,000) | (5,476,000) | (36,343,000)
Other | (15,609,000) | 28,000 | (99,797,000)
Net cash used in investing activities | (53,762,000) | 62,336,000 | (96,307,000)
Cash flows from financing activities: |  |  |
Proceeds from issuance of debt | (638,000) | 0 | 0
Repayment of debt | (196,000) | 0 | 0
Proceeds from exercise of stock-based compensation awards | 0 | 0 |
Dividends paid | (21,000) | (20,000) | (11,000)
Repurchase of common stock | 0 | 0 | 0
Other | 653,000 | (867,000) | 55,000
Net cash used in financing activities | (202,000) | (887,000) | 44,000
Effect of exchange rate changes on cash and cash equivalents | (61,000) | (5,158,000) | 4,153,000
Net increase (decrease) in cash and cash equivalents | (1,109,000) | (18,065,000) | 33,192,000
Cash and cash equivalents at beginning of year | 51,801,000 | 69,866,000 | 36,674,000
Cash and cash equivalents at end of year | 50,692,000 | 51,801,000 | 69,866,000
Eliminations [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | (348,268,000) | (833,815,000) | (344,302,000)
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation | 0 | 0 | 0
Amortization of intangible assets | 0 | 0 | 0
Stock-based compensation | 0 | 0 | 0
Deferred income taxes | 0 | 0 | 0
Change in current assets and liabilities, net of acquisitions of businesses: |  |  |
Accounts receivable, net | 0 | 0 | 0
Inventories, net | 6,629,000 | (2,970,000) | (8,532,000)
Uniforms and other rental items in service | (2,148,000) | (5,115,000) | 5,819,000
Prepaid expenses | 0 | 0 | 0
Accounts payable | (3,000) | 0 | (4,000)
Accrued compensation and related liabilities | 0 | 0 | 0
Accrued liabilities | 19,000 | 18,000 | 16,000
Income taxes, current | 0 | 0 | 0
Net cash provided by operating activities | (343,771,000) | (841,882,000) | (347,003,000)
Cash flows from investing activities: |  |  |
Capital expenditures | 0 | 0 | 0
Proceeds from redemption of marketable securities | 0 | 0 | 0
Purchase of marketable securities and investments | 11,672,000 | 412,839,000 | 55,466,000
Acquisitions of businesses, net of cash acquired | 0 | 0 | 0
Other | 332,118,000 | 429,061,000 | 291,553,000
Net cash used in investing activities | 343,790,000 | 841,900,000 | 347,019,000
Cash flows from financing activities: |  |  |
Proceeds from issuance of debt | 0 | 786,000 | 0
Repayment of debt | (19,000) | (804,000) | (16,000)
Proceeds from exercise of stock-based compensation awards | 0 | 0 |
Dividends paid | 0 | 0 | 0
Repurchase of common stock | 0 | 0 | 0
Other | 0 | 0 | 0
Net cash used in financing activities | (19,000) | (18,000) | (16,000)
Effect of exchange rate changes on cash and cash equivalents | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents at beginning of year | 0 | 0 | 0
Cash and cash equivalents at end of year | $ 0 | $ 0 | $ 0

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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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