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Derivative Instruments And Hedging Activities (Fair Values Of Derivative Instruments On The Consolidated Balance Sheets) (Details) - Designated As Hedging Instrument - Interest Rate Swaps - USD ($)
$ in Thousands
Aug. 31, 2017
Feb. 28, 2017
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Assets $ 233 $ 2,997
Accounts Payable    
Derivatives, Fair Value [Line Items]    
Liabilities $ (4,388) $ (509)