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Derivatives and Hedging (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Oct. 31, 2014
Interest Rate Swap
Derivative
Oct. 31, 2013
Interest Rate Swap
Oct. 31, 2014
Interest Rate Swap
Other liabilities
Jul. 31, 2014
Interest Rate Swap
Other liabilities
Oct. 31, 2014
First interest rate swap
Oct. 31, 2014
Second interest rate swap
Derivative [Line Items]            
Derivative, type of instrument Interest rate swap          
Number of interest rate derivatives held 2          
Notional amount of interest rate swap $ 275.0          
Derivative, fixed interest rate         0.85% 0.69%
Portion of notional amount at fixed interest rate         225 50
Derivative designated as cash flow hedge, Fair value     1.5 1.7    
Reclassification adjustment out of other comprehensive income into interest expense 0.5 0.6        
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