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Long-Term Debt (Detail Textuals) (USD $)
In Millions, unless otherwise specified
0 Months Ended 7 Months Ended 9 Months Ended
Mar. 01, 2013
Feb. 28, 2013
Apr. 30, 2013
Apr. 30, 2013
Revolving Credit Facility
Apr. 30, 2013
Revolving Credit Facility
Minimum
Apr. 30, 2013
Revolving Credit Facility
Maximum
Apr. 30, 2013
Alternative currency borrowing credit facility
Apr. 30, 2013
Letter of Credit
Apr. 30, 2013
Term Loan Facility
Apr. 30, 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     $ 100.0 $ 50.0 $ 500.0 $ 400.0 $ 400.0
Net leverage ratio 1.5:1 1:1                  
Outstanding borrowings                 387.5    
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     0.20%                
Applicable interest rate added to reference rate in order to compute variable interest rate     1.75%   1.50% 2.00%          
Commitment fee percentage         0.075% 0.125%