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Derivatives and Hedging (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jan. 31, 2014
Interest Rate Swap
Derivative
Jan. 31, 2013
Interest Rate Swap
Jan. 31, 2014
Interest Rate Swap
Derivative
Jan. 31, 2013
Interest Rate Swap
Jan. 31, 2014
Interest Rate Swap
Other liabilities
Jul. 31, 2013
Interest Rate Swap
Other liabilities
Jan. 31, 2014
First interest rate swap
Jan. 31, 2014
Second interest rate swap
Derivative [Line Items]                
Derivative, type of instrument     Interest rate swap          
Number of interest rate derivatives held 2   2          
Notional amount of interest rate swap $ 331.3   $ 331.3          
Derivative, fixed interest rate             0.85% 0.69%
Portion of notional amount at fixed interest rate             262.5 68.8
Derivative designated as cash flow hedge, Fair value         2.5 2.7    
Reclassification adjustment out of other comprehensive income into interest expense 0.6 0.6 1.2 1.3        
Description of interest rate cash flow hedge accounting method     Hypothetical derivative method          
Amortization on notional amount per quarter through September 30, 2015 18.8   18.8          
Amortization on notional amount on December 14, 2015 $ 200.0   $ 200.0          
Derivative, description of variable rate basis     one month LIBOR rate