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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2021
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, 2021, 2020 and 2019 was as follows:

 

 

 

Balance at

beginning of

year

 

 

Additions

 

 

Deductions

 

 

Balance at

end of

year

 

Year ended January 31, 2021

 

$

880

 

 

 

9,534

 

 

 

(6,386

)

 

$

4,028

 

Year ended January 31, 2020

 

$

1,499

 

 

 

1,684

 

 

 

(2,303

)

 

$

880

 

Year ended January 31, 2019

 

$

1,326

 

 

 

3,919

 

 

 

(3,746

)

 

$

1,499