Accounts receivable reserves (Tables)

12 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Schedule of accounts receivable reserve

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