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Goodwill, Service Contracts and Other Assets (Information Regarding Service Contracts and Other Assets) (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2013 | May 31, 2012 | May 31, 2011
Information regarding service contracts and other assets |  |  |  |  |
Service contracts, Net | $ 92,153,000 |  | $ 76,822,000 |  | $ 102,312,000
Other assets, Carrying Amount | 202,099,000 |  | 186,062,000 |  |
Other assets, Accumulated Amortization | 77,709,000 |  | 73,226,000 |  |
Other assets, Net | 124,390,000 |  | 112,836,000 |  |
Cash surrender value of insurance policies | 73,000,000 |  | 57,400,000 |  |
Equity method investments | 27,600,000 |  | 31,900,000 |  |
Cost method investments | 900,000 |  | 900,000 |  |
Gain on sale of equity investments | 8,500,000 |  |  |  |
Noncompete and consulting agreements [Member] |  |  |  |  |
Information regarding service contracts and other assets |  |  |  |  |
Other assets, Carrying Amount | 77,863,000 |  | 76,036,000 |  |
Other assets, Accumulated Amortization | 72,970,000 |  | 69,954,000 |  |
Other assets, Net | 4,893,000 |  | 6,082,000 |  |
Investments [Member] |  |  |  |  |
Information regarding service contracts and other assets |  |  |  |  |
Other assets, Carrying Amount | 101,525,000 | [1] | 90,198,000 | [1] |
Other assets, Accumulated Amortization | 0 | [1] | 0 | [1] |
Other assets, Net | 101,525,000 | [1] | 90,198,000 | [1] |
Other [Member] |  |  |  |  |
Information regarding service contracts and other assets |  |  |  |  |
Other assets, Carrying Amount | 22,711,000 |  | 19,828,000 |  |
Other assets, Accumulated Amortization | 4,739,000 |  | 3,272,000 |  |
Other assets, Net | 17,972,000 |  | 16,556,000 |  |
Service contracts [Member] |  |  |  |  |
Information regarding service contracts and other assets |  |  |  |  |
Service contracts, Carrying Amount | 420,499,000 |  | 384,622,000 |  |
Service contracts, Accumulated Amortization | 328,346,000 |  | 307,800,000 |  |
Service contracts, Net | $ 92,153,000 |  | $ 76,822,000 |  |
[1] | Investments at May 31, 2013, include the cash surrender value of insurance policies of $73.0 million, equity method investments of $27.6 million and cost method investments of $0.9 million. During fiscal 2013, Cintas sold stock of an equity method investment for a gain of $8.5 million. Investments at May 31, 2012, include the cash surrender value of insurance policies of $57.4 million, equity method investments of $31.9 million and cost method investments of $0.9 million.

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