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Acquisition - Summary of Amounts Recognized for Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Jan. 31, 2017
Jan. 31, 2016
Dec. 31, 2015
Jan. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 3,997 $ 4,155   $ 5,594
Klein Associates Inc. [Member]        
Business Acquisition [Line Items]        
Working capital     $ 2,572  
Property, plant and equipment     3,416  
Intangible assets     2,350  
Goodwill     $ 1,662