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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Sep. 30, 2019
Allowance For Doubtful Accounts [Abstract]  
Allowance for Doubtful Accounts

The following table summarizes changes in the valuation of the allowance for doubtful accounts (in thousands):

 

Year Ended September 30,

 

Beginning

Balance

 

 

Charged to

Operations

 

 

Write-offs

 

 

Ending

Balance

 

2019

 

$

17,584

 

 

$

9,478

 

 

$

(13,967

)

 

$

13,095

 

2018

 

 

11,829

 

 

 

10,948

 

 

 

(5,193

)

 

 

17,584

 

2017

 

 

14,812

 

 

 

2,914

 

 

 

(5,897

)

 

 

11,829