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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2019
Summary Of Significant Accounting Policies [Abstract]  
Activity of Allowance for Doubtful Accounts The activity of the allowance for doubtful accounts for the years ended January 31, 2019, 2018 and 2017 was as follows:

 

 

 

Balance at

beginning of

year

 

 

Additions

 

 

Deductions

 

 

Balance at

end of

year

 

Year ended January 31, 2019

 

$

1,326

 

 

 

3,919

 

 

 

(3,746

)

 

$

1,499

 

Year ended January 31, 2018

 

$

588

 

 

 

4,435

 

 

 

(3,697

)

 

$

1,326

 

Year ended January 31, 2017

 

$

664

 

 

 

4,892

 

 

 

(4,968

)

 

$

588