Treasury Stock - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
	Jun. 29, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	May 31, 2017	Mar. 31, 2017	Sep. 30, 2015	Sep. 30, 2013
Stockholders' Equity Note [Abstract]
Number of shares authorized to be repurchased (up to) (in shares)			7,000,000		2,000,000	5,000,000	170,000	105,000
Purchased (in shares)		72,266	104,145	78,446
Purchased	$ 1,676,443	$ 2,214,756	$ 3,064,000	$ 3,141,000