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Supplementary Financial Information (Tables) | 12 Months Ended
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Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of allowance for doubtful accounts | 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.

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