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v3.20.2

Debt - Energy Services (Details) - Energy Services - USD ($) | Mar. 06, 2020 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | $ 260,000,000 | $ 200,000,000
Line of Credit | Energy Services Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 260,000,000 |  |
Line of credit facility accordion feature increase limit | $ 325,000,000 |  |
Variable interest rate floor (as a percentage) | 1.00% |  |
Line of Credit | Energy Services Credit Agreement | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate floor (as a percentage) | 0.75% |  |
Line of Credit | Energy Services Credit Agreement | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate floor (as a percentage) | 2.75% |  |
Line of Credit | Energy Services Credit Agreement | Federal Funds Effective Swap Rate |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percentage) | 0.50% |  |
Line of Credit | Energy Services Credit Agreement | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percentage) | 1.00% |  |
Line of Credit | Energy Services Credit Agreement | Alternate Rate And Adjusted L I B O R | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate floor (as a percentage) | 1.50% |  |
Line of Credit | Energy Services Credit Agreement | Alternate Rate And Adjusted L I B O R | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate floor (as a percentage) | 2.50% |  |
Letter of Credit | Line of Credit | Energy Services Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 50,000,000 |  |

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- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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