Other Investments (Investment in Unconsolidated Entity) (Details) - MVP - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Statement
AFUDC	$ 479,586,911	$ 295,430,776
Net Other Income	714,128	5,655,644
Net Income	480,301,039	301,086,420
Assets:
Current Assets	513,713,429	485,323,892
Construction Work in Progress	5,536,248,668	4,675,267,389
Other Assets	4,597,441	13,190,816
Total Assets	6,054,559,538	5,173,782,097
Liabilities and Equity:
Current Liabilities	187,581,804	466,776,233
Noncurrent Liabilities	245,000	0
Capital	5,866,732,734	4,707,005,864
Total Liabilities and Equity	$ 6,054,559,538	$ 5,173,782,097