Accounts Receivable (Allowance for Doubtful Accounts Rollforward) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 548	$ 22
Provision adjustment - expense, net of recoveries	62	599
Write-offs and other adjustments - deductions to receivable balances	(315)	(23)
Balance at end of period	$ 295	$ 598