Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Receivables, Allowance for Uncollectible Accounts	$ 28,592	$ 22,526
Common Stock, Par Value	$ 1	$ 1
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares Issued	85,881,897	85,543,125
Common Stock, Shares Outstanding	85,881,897	85,543,125