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Long-Term Debt, Derivatives and Letters of Credit - Additional Information (Detail)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2012
USD ($)
May 31, 2012
LIBOR
Aug. 31, 2013
Economic Hedge
USD ($)
Aug. 31, 2013
Economic Hedge
EUR (€)
Aug. 31, 2013
Standby Letters of Credit
USD ($)
May 31, 2013
Standby Letters of Credit
USD ($)
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%          
Outstanding letter of credit         13.7 13.1
Borrowing under credit facility     $ 16.4 € 12.3