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Supplementary Financial Information
 12 Months Ended
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplementary Financial Information
Supplementary Financial Information

The following is a summary of the activity in our allowance for doubtful accounts:
 
 
Years Ended September 30,
 
2017
 
2016
 
2015
 
(dollars in thousands)
Balance at beginning of year
$
3,730

 
$
5,009

 
$
2,846

Provision / (Reversal)
(720
)
 
1,698

 
(194
)
Write offs
(1,249
)
 
(1,942
)
 
(130
)
Acquired through business acquisitions
—

 
—

 
1,397

Adjustment (1) (2)
(895
)
 
(1,035
)
 
1,090

Balance at end of year
$
866

 
$
3,730

 
$
5,009


(1) 2015 amount primarily relates to cancellation fees that were legally owed to us but for which collectability was not assured. A portion of these fees were collected in 2016, and the remainder were written off.
(2) Includes foreign currency translation adjustments.