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Commitments and Contingencies (Details 2) (RDG Realty [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Nov. 03, 2011
sqft
Jul. 31, 2012
RDG Realty [Member]
   
Operating Leased Assets [Line Items]    
Square footage of agreed-upon rentable area (in square feet) 154,100  
Building lease term (in years) 15 years  
Operating leases, future minimum rental commitments   $ 64.9