Goodwill, Service Contracts and Other Assets (Details 2) (Service Contracts, USD $) In Thousands	3 Months Ended
	Aug. 31, 2011
Service contracts
Balance at the beginning of the period	$ 102,312
Service contracts acquired	366
Service contracts amortization	(8,221)
Foreign currency translation	(26)
Balance at the end of the period	94,431
Rental Uniforms and Ancillary Products
Service contracts
Balance at the beginning of the period	44,628
Service contracts amortization	(4,268)
Foreign currency translation	(32)
Balance at the end of the period	40,328
First Aid, Safety and Fire Protection
Service contracts
Balance at the beginning of the period	35,878
Service contracts amortization	(1,846)
Balance at the end of the period	34,032
Document Management
Service contracts
Balance at the beginning of the period	21,806
Service contracts acquired	366
Service contracts amortization	(2,107)
Foreign currency translation	6
Balance at the end of the period	$ 20,071