Segment Reporting - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Jan. 31, 2013
Concentration Risk [Line Items]
Accounts receivable	$ 25,449		$ 25,449		$ 20,153
Wintech And Chicony [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 22,900		$ 22,900		$ 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%	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	86.00%	78.00%	85.00%	79.00%
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%	10.00%	10.00%