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Goodwill, Service Contracts and Other Assets (Details 3) (USD $)
 6 Months Ended
Nov. 30, 2011
Nov. 30, 2010
May 31, 2011
Information regarding service contracts and other assets      
Other Assets, Carrying Amount $ 187,325,000   $ 183,423,000
Other Assets, Accumulated Amortization 72,841,000   68,672,000
Other Assets, Net 114,484,000   114,751,000
Investments      
Cash surrender value of insurance policies 54,800,000   51,100,000
Equity method investments 30,800,000   30,200,000
Cost method investments 2,900,000   2,900,000
Amortization      
Amortization expense 20,104,000 21,182,000  
Estimated amortization expense, year one 37,900,000    
Estimated amortization expense, year two 21,100,000    
Estimated amortization expense, year three 17,600,000    
Estimated amortization expense, year four 14,800,000    
Estimated amortization expense, year five 9,600,000    
Noncompete and consulting agreements
      
Information regarding service contracts and other assets      
Other Assets, Carrying Amount 75,790,000   76,091,000
Other Assets, Accumulated Amortization 67,330,000   63,982,000
Other Assets, Net 8,460,000   12,109,000
Investments
      
Information regarding service contracts and other assets      
Other Assets, Carrying Amount 88,469,000   84,197,000
Other Assets, Net 88,469,000   84,197,000
Other
      
Information regarding service contracts and other assets      
Other Assets, Carrying Amount 23,066,000   23,135,000
Other Assets, Accumulated Amortization 5,511,000   4,690,000
Other Assets, Net 17,555,000   18,445,000
Service Contracts
      
Information regarding service contracts and other assets      
Service contracts, Carrying Amount 379,021,000   379,967,000
Service contracts, Accumulated Amortization 292,360,000   277,655,000
Service contracts, Net $ 86,661,000   $ 102,312,000