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Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2016
USD ($)
Jan. 31, 2016
USD ($)
item
Nov. 30, 2017
USD ($)
Nov. 30, 2016
USD ($)
Nov. 30, 2017
USD ($)
Nov. 30, 2016
USD ($)
Accrual for warranty returns            
Beginning balance     $ 22,094 $ 19,459 $ 21,766 $ 20,622
Additions to the accrual     14,473 14,858 40,655 43,052
Reductions of the accrual - payments and credits issued     (12,914) (12,457) (38,768) (41,814)
Ending balance     $ 23,653 $ 21,860 $ 23,653 $ 21,860
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   $ 17,800        
Amount of additional pre-judgment compensation $ 1,500