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Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 3 Months Ended
May 31, 2016
USD ($)
Jan. 31, 2016
USD ($)
item
May 31, 2017
USD ($)
May 31, 2016
USD ($)
Accrual for warranty returns        
Beginning balance     $ 21,766 $ 20,622
Additions to the accrual     12,239 14,523
Reductions of the accrual - payments and credits issued     (13,376) (16,164)
Ending balance $ 18,981   $ 20,629 $ 18,981
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