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Derivatives and Hedging (Detail Textuals) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jan. 31, 2013
Derivative
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 $ 406.3
Description of interest rate cash flow hedge accounting method Hypothetical derivative method
Amortization on notional amount per quarter through September 30, 2015 18.8
Amortization on notional amount on December 14, 2015 200.0
Derivative, description of variable rate basis one month LIBOR rate
Interest Rate Swap | Other liabilities
  
Derivative [Line Items]  
Derivative designated as cash flow hedge, Fair value 3.6
First interest rate swap
  
Derivative [Line Items]  
Portion of notional amount at fixed interest rate 312.5
Derivative, fixed interest rate 0.85%
Second interest rate swap
  
Derivative [Line Items]  
Portion of notional amount at fixed interest rate $ 93.8
Derivative, fixed interest rate 0.69%