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Long-Term Debt, Derivatives and Letters of Credit - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Aug. 31, 2014
USD ($)
Aug. 31, 2014
Economic Hedge
USD ($)
Aug. 31, 2014
Economic Hedge
EUR (€)
Aug. 31, 2014
Eurodollar Libor Rate
Aug. 31, 2014
Standby Letters of Credit
USD ($)
May 31, 2014
Standby Letters of Credit
USD ($)
Line of Credit Facility [Line Items]            
Borrowing capacity $ 150          
Basis spread on LIBOR Rate       1.75%    
Maturity period July 2016          
Debt issuance costs 0.8          
Commitment fees on unused borrowing capacity       0.30%    
Borrowing under credit facility 66.0 16.2 12.3      
Outstanding letter of credit         $ 13.2 $ 13.6