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Long-Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Oct. 31, 2013
Oct. 31, 2013
Revolving Credit Facility
Mar. 01, 2013
Revolving Credit Facility
Minimum
Oct. 31, 2013
Revolving Credit Facility
Minimum
Sep. 29, 2011
Revolving Credit Facility
Minimum
Mar. 01, 2013
Revolving Credit Facility
Maximum
Oct. 31, 2013
Revolving Credit Facility
Maximum
Sep. 29, 2011
Revolving Credit Facility
Maximum
Oct. 31, 2013
Alternative currency borrowing credit facility
Oct. 31, 2013
Letter of Credit
Oct. 31, 2013
Term Loan Facility
Oct. 31, 2013
Term Loan Facility
Original Limit
Jan. 14, 2011
Term Loan Facility
Original Limit
Line of Credit Facility [Line Items]                          
Maximum borrowing capacity   $ 100.0     $ 400.0     $ 500.0 $ 100.0 $ 50.0   $ 400.0 $ 400.0
Net leverage ratio     1:1     1.5:1              
Outstanding borrowings                     350.0    
Quarterly payments for term loan                     $ 18.8    
Maturity date   Dec. 14, 2015                      
Reference rate basis (i) the Eurocurrency Rate; (ii) the Federal Funds Rate; or (iii) the Prime Rate as described in the Credit Facility                        
Reference rate 0.18%                        
Applicable interest rate added to reference rate in order to compute variable interest rate 1.50%     1.50%     2.00%            
Commitment fee percentage       0.075%     0.125%            
Line of credit facility interest rate during period 2.00%