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Comprehensive Loss (Details) (USD $)
Nov. 30, 2013
Feb. 28, 2013
Unrealized holding gains (losses) on cash flow hedges $ (1,726,000) $ (2,729,000)
Interest rate swaps
    
Unrealized holding gains (losses) on cash flow hedges (1,388,000) (3,135,000)
Net deferred tax benefits 750,000 1,690,000
Foreign currency contracts
    
Unrealized holding gains (losses) on cash flow hedges (338,000) 406,000
Net deferred tax benefits 90,000  
Net deferred tax expense   $ 90,000