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Variable Interest Entities (Details) (USD $)
12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Amount of note receivable from reporting entity     $ 2,000,000
Asset impairment charge 0 0 (2,561,000)
Employee Housing Entities [Member]
     
Carrying amount of consolidated VIE assets 29,100,000    
Carrying amount of consolidated VIE liabilities 62,800,000    
Amount outstanding in letters of credit 53,400,000    
Avon Partners II LLC [Member]
     
Carrying amount of consolidated VIE assets 4,400,000    
Carrying amount of consolidated VIE liabilities $ 0