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Notes Payable and Credit Agreements - Additional Information (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 26, 2020 USD ($) bank | Sep. 30, 2020 USD ($) | Dec. 14, 2016 bank
Line of Credit Facility [Line Items] |  |  |
Long-term debt |  | $ 975,000,000.0 |
Liabilities | Lender Concentration Risk |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, number of banks in agreement | bank |  |  | 11
Spire |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan bear interest rate per annum |  | 1.70% |
Short-term borrowings used to support lending to Utilities |  | $ 449,800,000 |
Spire | Term Loan |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, number of banks in agreement | bank | 2 |  |
Long-term debt | $ 150,000,000.0 |  |
Debt instrument, maturity date | Mar. 25, 2021 |  |
Team loan interest rate description |  | The term loan bears interest at the LIBOR Rate (as defined in the loan agreement) plus 0.85% per annum. |
Term loan bear interest rate per annum |  | 1.60% |
Spire | Term Loan | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan bear interest rate per annum | 0.85% |  |
Revolving Credit Facility Borrowings |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility borrowing capacity |  | $ 975,000,000.0 |
Minimum required ratio of earnings before interest, taxes, depreciation, and amortization (EBITDA) times interest expense as required by the line of credit covenant |  | 70.00% |
Revolving Credit Facility Borrowings | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt to total capitalization ratio |  | 0.60 |
Revolving Credit Facility Borrowings | Spire |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility borrowing capacity |  | $ 300,000,000.0 |
Term loan bear interest rate per annum |  | 1.90% |
Revolving Credit Facility Borrowings | Spire Missouri |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility borrowing capacity |  | $ 475,000,000.0 |
Term loan bear interest rate per annum |  | 1.90% |
Revolving Credit Facility Borrowings | Spire Alabama |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility borrowing capacity |  | $ 200,000,000.0 |
Term loan bear interest rate per annum |  | 1.90% |
Commercial Paper Notes |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility borrowing capacity |  | $ 975,000,000.0 |
Debt term |  | 365 days |
Commercial Paper Notes | Spire |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan bear interest rate per annum |  | 1.70% |

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