XML 58 R32.htm IDEA: XBRL DOCUMENT v2.4.0.8
Percentage of Total Accounts Receivable (Detail)
Jan. 31, 2014
Jan. 31, 2013
Payor A
   
Accounts Receivable [Line Items]    
Receivables from customers as percentage of total accounts receivable 9.90% 11.00%
Payor B
   
Accounts Receivable [Line Items]    
Receivables from customers as percentage of total accounts receivable 31.50% 36.00%
Payor C
   
Accounts Receivable [Line Items]    
Receivables from customers as percentage of total accounts receivable 4.50% 8.50%