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Warranty (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Warranty claim activity    
Beginning accrued warranty balance $ 1,000 $ 1,400
Provision 600 630
Provision for (benefits from) prior year (220) (490)
Costs incurred (380) (540)
Ending accrued warranty balance $ 1,000 $ 1,000
Minimum [Member]
   
Warranty [Line Items]    
Product warranty period 5 years  
Maximum [Member]
   
Warranty [Line Items]    
Product warranty period 10 years