Annual report pursuant to Section 13 and 15(d)

Treasury Stock - Narrative (Details)

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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