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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2014
Activity of Allowance for Doubtful Accounts

The activity of the allowance for doubtful accounts for the years ended January 31, 2014, 2013 and 2012 was as follows:

 

     Balance at
beginning of
year		      Additions      Deductions     Balance at
end of
year		  

Year ended January 31, 2014

    $ 1,681         4,400         (4,370 )    $ 1,711   

Year ended January 31, 2013

    $ 1,614         5,019         (4,952 )    $ 1,681   

Year ended January 31, 2012

    $ 1,015         3,920         (3,321 )    $ 1,614   
Activity of Sales Return Reserve

The activity of the sales returns reserve for the years ended January 31, 2014, 2013 and 2012 was as follows:

 

     Balance at
beginning of
year		      Additions      Deductions     Balance at
end of
year		  

Year ended January 31, 2014

    $ 14,448         64,313         (61,672 )    $ 17,089   

Year ended January 31, 2013

    $ 10,967         49,412         (45,931 )    $ 14,448   

Year ended January 31, 2012

    $ 11,367         41,034         (41,434 )    $ 10,967