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Commitments and Contingencies (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2016
USD ($)
May 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Nov. 30, 2015
USD ($)
Nov. 30, 2016
USD ($)
Nov. 30, 2015
USD ($)
Jan. 22, 2016
item
Accrual for warranty returns              
Beginning balance $ 19,459 $ 20,622 $ 23,538 $ 20,797 $ 20,622 $ 23,553  
Additions to the accrual 14,858     17,127 43,052 43,885  
Reductions of the accrual - payments and credits issued (12,457)     (14,386) (41,814) (43,900)  
Ending balance $ 21,860   20,622 $ 23,538 $ 21,860 $ 23,538  
Minimum              
Accrual for warranty returns              
Product warranty period         2 years    
Maximum              
Accrual for warranty returns              
Product warranty period         5 years    
Thermometer Patent Litigation | Litigation              
Commitments and contingencies              
Number of models | item             2
Charge including legal fees and other related expenses     17,830        
Charge including legal fees and other related expenses, after tax     $ 17,790        
Amount of additional pre-judgment compensation   $ 1,470