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Financial Instruments and Risk Management (Details 2) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended
May 31, 2014
May 31, 2014
3.90 percent fixed rate Senior Notes
Jun. 30, 2014
Floating interest rate Senior Notes due June 2014
May 31, 2014
Floating interest rate Senior Notes due June 2014
May 31, 2014
Interest rate swaps
Floating interest rate Senior Notes due June 2014
Financial instruments and risk management          
Fixed rate debt   $ 80,000,000      
Fixed interest rate (as a percent)   3.90%      
Floating rate debt 345,710,000        
Senior Notes Bearing Variable Interest Amount       75,000,000  
Effective fixed interest rate on debt (as a percent)   3.90%   6.01% 6.01%
Derivative fixed interest rate (as a percent)         5.11%
Derivative variable rate (as a percent)         0.23%
Base rate, description         three-month LIBOR
Percentage of change in floating interest rate offset by swap         100.00%
Effectiveness percentage of swap         100.00%
Repayments of Long-term Debt $ 1,900,000   $ 75,000,000