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Segment Reporting - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Schedule Of Sales Revenue By Business Segment [Line Items]                      
Reduction in capital expenditures and fixed assets                 $ 32 $ 349 $ 272
Revenues 23,647 20,275 20,895 27,291 28,401 18,574 23,080 34,630 92,108 104,685 112,834
Intersegment Sales Elimination [Member]
                      
Schedule Of Sales Revenue By Business Segment [Line Items]                      
Revenues                 $ 166 $ 1,041 $ 297