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Customers Contributed Percentage of Revenue (Detail)
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Payor A
   
Percentage Of Revenue [Line Items]    
Revenue from major customers as percentage of total revenues 15.90% 22.00%
Payor B
   
Percentage Of Revenue [Line Items]    
Revenue from major customers as percentage of total revenues 15.90% 0.00%
Payor C
   
Percentage Of Revenue [Line Items]    
Revenue from major customers as percentage of total revenues 15.50% 0.00%