Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Statement of Financial Position [Abstract]
Receivables, allowance for uncollectible accounts	$ 37,116	$ 36,295
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	92,115,581	91,819,405
Common stock, shares outstanding (in shares)	92,115,581	91,819,405