Stockholders' Equity (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock outstanding (in shares)	0
Common stock authorized (in shares)	63,000,000	63,000,000
Common stock issued (in shares)	33,522,046	33,515,768
Common stock outstanding (in shares)	33,522,046	33,515,768
Number of shares surrendered by employees	229,191	32,035	16,779
Value of redeemed stock	$ 3,378,000	$ 415,000	$ 222,000
Dividends paid	$ 0	$ 0	$ 0
382 ownership limitation	4.95%