Accounts Receivable - Allowance For Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 3,363	$ 3,279	$ 3,332
Provision adjustment - expense, net of recoveries	245	119	(53)
Write-offs and other adjustments - additions (deductions) to receivable balances	(3,475)	(35)	0
Balance at end of period	$ 133	$ 3,363	$ 3,279