Income Taxes	6 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes    The effective tax rates for the quarters ended March 31, 2023 and March 31, 2022 were 26.2% and 25.6%, respectively. The effective tax rates for the six months ended March 31, 2023 and March 31, 2022 were 25.7% and 25.5%, respectively. During the quarter and six months ended March 31, 2022, the Company was able to utilize the Enhanced Oil Recovery tax credit, which was not available during the quarter and six months ended March 31, 2023 due to the sale of its California properties.     On April 14, 2023, the IRS issued guidance that provides a safe harbor method of accounting that taxpayers may use to determine whether expenses to repair, maintain, replace, or improve natural gas transmission and distribution property must be capitalized. The Company is currently analyzing this guidance to determine the potential impact on the financial statements.