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Commitments and Contingencies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Commitments and contingencies        
Charge for transfer of ownership in a life insurance policy $ 6,710   $ 6,710  
Accrual for warranty returns        
Beginning balance 20,797 $ 22,492 23,553 $ 19,269
Additions to the accrual 17,127 16,574 43,885 46,088
Reductions of the accrual - payments and credits issued (14,386) (13,821) (43,900) (40,112)
Ending balance 23,538 $ 25,245 $ 23,538 25,245
Former Chief Executive Officer        
Commitments and contingencies        
Charge for transfer of ownership in a life insurance policy 6,710      
After tax charge for transfer of ownership in a life insurance policy $ 4,640      
Charge per fully diluted share for transfer of ownership in a life insurance policy (in dollars per share) $ 0.16      
Healthy Directions        
Accrual for warranty returns        
Additions to the accrual       3,190
Reductions of the accrual - payments and credits issued       $ (1,820)
Minimum        
Accrual for warranty returns        
Product warranty period     2 years  
Maximum        
Accrual for warranty returns        
Product warranty period     5 years