Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Condensed Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 0.7	$ 0.8
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	3,000,000	3,000,000
Common stock, shares outstanding	684,004	678,006