Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details Textual)

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Derivative Instruments (Details Textual) (USD $)
 6 Months Ended
Aug. 31, 2012
Apr. 30, 2012
Feb. 29, 2012
Derivative Instruments (Textual)      
Maturity of foreign currency contracts generally less than 12 months    
Notional value of undesignated foreign currency contracts outstanding $ 273,200,000   $ 148,600,000
Notional value of undesignated interest rate swap agreements 1,000,000,000 500,000,000 0
Average maturity period of cash flow hedges generally within three years or less    
Maximum maturity period of cash flow hedges 5 years    
Notional value of cash flow designated foreign currency contracts outstanding 199,300,000   353,700,000
Notional value of cash flow designated interest rate swap agreements outstanding 500,000,000 500,000,000 500,000,000
Notional value of cash flow designated diesel fuel swap agreements outstanding 13,900,000   0
Amount of net losses, net of income tax effect, to be reclassified from AOCI to earnings within the next 12 months 6,800,000    
Fair value of derivative instruments in a net liability position due to counterparties 51,500,000    
Fair value of derivative instruments in a net receivable position due from counterparties $ 3,700,000