CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Statement of Financial Position [Abstract]
Accounts receivable, net of credit loss	$ 299	$ 356
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	84,209,000	84,014,000
Common stock, shares outstanding (in shares)	77,302,000	77,108,000
Treasury stock at cost (in shares)	6,906,000	6,906,000