Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Current Assets
Allowance for accounts receivable	$ 2,490	$ 2,068
Common Stock
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	112,222,865	112,222,865
Common stock, shares outstanding (in shares)	105,285,460	107,898,859
Preferred Stock
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Treasury Stock
Treasury stock, shares (in shares)	6,937,405	4,324,006