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Financial Instruments and Risk Management (Details 2) (USD $)
6 Months Ended 0 Months Ended 12 Months Ended
Aug. 31, 2014
Aug. 31, 2014
3.90 percent fixed rate Senior Notes
Jun. 30, 2014
Floating interest rate Senior Notes due June 2014
Feb. 28, 2014
Floating interest rate Senior Notes due June 2014
Feb. 28, 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 524,610,000        
Senior Notes Bearing Variable Interest Amount       75,000,000  
Effective fixed interest rate on debt (as a percent)   3.90%     6.01%
Percentage of change in floating interest rate offset by swap         100.00%
Effectiveness percentage of swap         100.00%
Repayment of principal $ 76,900,000   $ 75,000,000