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Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Warranty claim activity        
Beginning balance $ 1,000 $ 1,000 $ 950 $ 1,000
Provision 89 134 332 352
Costs incurred (89) (134) (282) (352)
Ending balance $ 1,000 $ 1,000 $ 1,000 $ 1,000
Minimum [Member]        
Warranty [Line Items]        
Product warranty period     5 years  
Maximum [Member]        
Warranty [Line Items]        
Product warranty period     10 years