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Goodwill, Service Contracts and Other Assets (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2012 | May 31, 2011
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | $ 102,312 | $ 103,445
Service contracts acquired | 6,654 | 30,876
Service contracts amortization | (30,170) | (34,500)
Foreign currency translation | (1,974) | 2,491
Balance at the end of the period | 76,822 | 102,312
Rental Uniforms and Ancillary Products [Member] |  |
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | 44,628 | 48,711
Service contracts acquired | 1,346 | 13,090
Service contracts amortization | (15,569) | (19,081)
Foreign currency translation | (1,249) | 1,908
Balance at the end of the period | 29,156 | 44,628
Uniform Direct Sales [Member] |  |
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | 0 | 0
Service contracts acquired | 0 | 0
Service contracts amortization | 0 | 0
Foreign currency translation | 0 | 0
Balance at the end of the period | 0 | 0
First Aid, Safety and Fire Protection [Member] |  |
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | 35,878 | 35,599
Service contracts acquired | 838 | 7,498
Service contracts amortization | (7,382) | (7,219)
Foreign currency translation | 0 | 0
Balance at the end of the period | 29,334 | 35,878
Document Management [Member] |  |
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | 21,806 | 19,135
Service contracts acquired | 4,470 | 10,288
Service contracts amortization | (7,219) | (8,200)
Foreign currency translation | (725) | 583
Balance at the end of the period | $ 18,332 | $ 21,806

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