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Derivatives and Hedging (Details Textuals) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Derivative
Jul. 31, 2012
Derivative [Line Items]    
Number of interest rate derivatives held 2  
Interest Rate Swap
    
Derivative [Line Items]    
Number of interest rate derivatives held 2  
Derivative, type of instrument Interest rate swap  
Amount reclassified into earnings $ 2.5 $ 2.1
Description of interest rate cash flow hedge accounting method Hypothetical derivative method  
Amortization on notional amount per quarter through September 30, 2015 18.8  
Amortization on notional amount on December 14, 2015 200.0  
Derivative, description of variable rate basis one month LIBOR rate  
Interest Rate Swap | Level II
    
Derivative [Line Items]    
Derivative designated as cash flow hedge, Fair value 2.7 4.9
Interest Rate Swap | Cash flow hedging
    
Derivative [Line Items]    
Notional amount of interest rate swap 368.8  
Interest Rate Swap | Other liabilities
    
Derivative [Line Items]    
Derivative designated as cash flow hedge, Fair value 2.7  
First interest rate swap
    
Derivative [Line Items]    
Portion of notional amount at fixed interest rate 287.5  
Derivative, fixed interest rate 0.85%  
Second interest rate swap
    
Derivative [Line Items]    
Portion of notional amount at fixed interest rate $ 81.3  
Derivative, fixed interest rate 0.69%