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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2013
Activity of Allowance for Doubtful Accounts

The activity of the allowance for doubtful accounts for the years ended January 31, 2013, 2012 and 2011 was as follows:

 

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

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   

Year ended January 31, 2011

    $ 1,284         2,397         (2,666 )    $ 1,015   
Activity of Sales Return Reserve

The activity of the sales returns reserve for the years ended January 31, 2013, 2012 and 2011 was as follows:

 

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

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   

Year ended January 31, 2011

    $ 9,912         41,692         (40,237 )    $ 11,367