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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Y
director
Jul. 31, 2011
Jul. 31, 2010
BCRC [Member]
     
Right to appoint the number of directors 4    
Number of directors 9    
Management agreement renewable period, years 1    
Management fees and reimbursement of operating expenses $ 6.9 $ 6.9 $ 7.0
SSF/VARE [Member]
     
Ownership interest 50.00%    
Real estate commission expense 0.9 3.4 3.5
Real estate revenue from leases $ 0.4 $ 0.4 $ 0.5