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Commitments And Contingencies (Narrative) (Details)
Feb. 28, 2019
USD ($)
Purchase Commitment [Member]  
Loss Contingencies [Line Items]  
Commitment outstanding $ 0
Indemnification Agreement 1 [Member]  
Loss Contingencies [Line Items]  
Liabilities related to indemnification agreement 0
Indemnification Agreement 2 [Member]  
Loss Contingencies [Line Items]  
Liabilities related to indemnification agreement $ 0