Stockholders' Equity (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
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)	33,515,768	33,071,331
Common stock outstanding (in shares)	33,515,768	33,071,331
Number of shares surrendered by employees	32,035	16,779	10,302
Value of redeemed stock	$ 415,000	$ 222,000	$ 192,000
Dividends paid	$ 0	$ 0	$ 0
382 ownership limitation	4.95%