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Related Party Transactions (Tables)
 6 Months Ended
Jul. 31, 2013
Related Party Transactions [Abstract]  
Revenue recognized from related party
The following table shows revenue recognized from these customers:
 
Three months ended July 31,
 
Six months ended July 31,
 
2013
 
2012
 
2013
 
2012
Revenues from customers
$
7,801

 
$
21,965

 
$
36,337

 
$
31,274

Percentage of total revenues
3.1
%
 
9.1
%
 
7.6
%
 
6.4
%