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Derivatives and Hedging (Details Textuals) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jan. 31, 2012
quantity
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 $ 481.3
Description of Cash Flow Hedge Accounting Method to measure hedge effectiveness hypothetical derivative method
Amortization of notional amount per quarter through November 30, 2015 18.8
Amortization of notional amount on December 14, 2015 200.0
Interest Rate Swap | Other liabilities
  
Derivative [Line Items]  
Derivative designated as cash flow hedge, Fair Value 3.8
First interest rate swap
  
Derivative [Line Items]  
Derivative, Description of Variable Rate Basis Applicable rate depending on company's consolidated net leverage ratio
Portion of notional amount at fixed interest rate 362.5
Derivative, Basis spread 85.00%
Second interest rate swap
  
Derivative [Line Items]  
Derivative, Description of Variable Rate Basis Applicable rate depending on company's consolidated net leverage ratio
Portion of notional amount at fixed interest rate $ 118.8
Derivative, Basis spread 69.00%