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Comprehensive Income (Loss) (Details) (USD $)
May 31, 2013
Feb. 28, 2013
Unrealized holding gains (losses) on cash flow hedges $ (2,284,000) $ (2,729,000)
Interest rate swaps
   
Unrealized holding gains (losses) on cash flow hedges (2,543,000) (3,135,000)
Net deferred tax benefits 1,370,000 1,690,000
Foreign currency contracts
   
Unrealized holding gains (losses) on cash flow hedges 259,000 406,000
Net deferred tax expense $ 60,000 $ 90,000