Annual report pursuant to Section 13 and 15(d)

Accounts receivable reserves

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Accounts receivable reserves
 12 Months Ended
Sep. 30, 2016
Receivables [Abstract]  
Accounts receivable reserves
Accounts receivable reserves
Changes in the reserves against accounts receivable were as follows (in thousands):
 
Year ended September 30,
 
2016
 
2015
 
2014
Balance at beginning of year
$
3,385

 
$
3,138

 
$
3,828

Additions to reserve
2,335

 
2,690

 
1,767

Deductions
(1,494
)
 
(2,443
)
 
(2,457
)
Balance at end of year
$
4,226

 
$
3,385

 
$
3,138


In evaluating the net realizable value of accounts receivable, we consider such factors as current economic trends, customer credit-worthiness, and changes in the customer payment terms and collection trends. Changes in the assumptions used in analyzing a specific account receivable may result in a reserve being recognized in the period in which the change occurs.
At September 30, 2016 and 2015, $16.2 million and $12.1 million of our unbilled receivables related to amounts pursuant to contractual retainage provisions. We anticipate that the majority of the fiscal 2016 balance will be collected during the 2017 fiscal year.