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Customers Contributed Percentage of Revenue (Detail)
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Customer A
   
Percentage Of Revenue [Line Items]    
Revenue from major customers as percentage of total revenues 8.00% 8.00%
Customer B
   
Percentage Of Revenue [Line Items]    
Revenue from major customers as percentage of total revenues 9.00% 17.00%
Customer C
   
Percentage Of Revenue [Line Items]    
Revenue from major customers as percentage of total revenues 22.00% 34.00%