CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2020	Sep. 30, 2019
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value per share (in dollars per share)	$ 1	$ 1.00
Common stock, shares authorized (in shares)	15,000,000	15,000,000
Common stock, shares issued (in shares)	8,416,145	8,416,145
Common stock, shares outstanding (in shares)	7,479,671	7,476,513
Treasury stock at cost, shares (in shares)	936,474	939,632