Segment Reporting - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Concentration Risk [Line Items]
Number of reportable segment	1
Accounts receivable	$ 18,837	$ 20,153
Wintech And Chicony [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 15,900	$ 17,600
Wintech And Chicony [Member] | Accounts receivable [Member] | Credit concentration risk [Member] | Minimum [Member]
Concentration Risk [Line Items]
Percentage of revenue or accounts receivable	10.00%	10.00%	10.00%
Wintech And Chicony [Member] | Sales revenue, net [Member] | Customer concentration risk [Member]
Concentration Risk [Line Items]
Percentage of revenue or accounts receivable	85.00%	80.00%	80.00%
Wintech And Chicony [Member] | Sales revenue, net [Member] | Customer concentration risk [Member] | Minimum [Member]
Concentration Risk [Line Items]
Percentage of revenue or accounts receivable	10.00%	10.00%	10.00%