Aggregate Commitments, Percentage

No definition available.

Name:	smc_AggregateCommitmentsPercentage
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Excess Cash Flow Offer To Purchase, Asset Sale Offer Expired

+ References

No definition available.

+ Details

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Namespace Prefix:	smc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Interest Coverage Ratio

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentCovenantInterestCoverageRatio
Namespace Prefix:	smc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Leverage Ratio

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentCovenantLeverageRatio
Namespace Prefix:	smc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, First Lien Net Leverage Ratio

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentFirstLienNetLeverageRatio
Namespace Prefix:	smc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Issued As A Percentage of Face Value

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentIssuedAsAPercentageOfFaceValue
Namespace Prefix:	smc_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Notice Of Redemption on Tender Offer, Redemption Amount

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentNoticeOfRedemptionOnTenderOfferRedemptionAmount
Namespace Prefix:	smc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument Redemption Irrevocable Deposit

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentRedemptionIrrevocableDeposit
Namespace Prefix:	smc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument Redemption Notice Amount

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentRedemptionNoticeAmount
Namespace Prefix:	smc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Redemption Price, Offer Amount

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentRedemptionPriceOfferAmount
Namespace Prefix:	smc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Tendered And Validly Accepted And Fully Discharged, Amount

+ References

No definition available.

+ Details

Name:	smc_DebtInstrumentTenderedAndValidlyAcceptedAndFullyDischargedAmount
Namespace Prefix:	smc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Paragraph 1B
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+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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-Topic 835
-SubTopic 30
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-Paragraph 2
-Publisher FASB
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-Topic 835
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
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-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
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-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
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-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
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-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SX 210.5-02(22)(b))
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-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
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-Section 50
-Paragraph 6
-Subparagraph (b)
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-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
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+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of an entity's outstanding debt that is designated as a hedged item in cash flow, fair value, or net investment hedge.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash inflow from the sale of other assets as part of operating activities.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=smc_ABLFacilityMember
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- Details

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Name:	dei_LegalEntityAxis=smc_SummitHoldingsMember
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- Details

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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
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Period Type:

- Details

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- Details

Name:	srt_RangeAxis=srt_MaximumMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=smc_CreditAgreementMember
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Period Type:

- Details

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Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_StandbyLettersOfCreditMember
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DEBT - Narrative (Details)				1 Months Ended	9 Months Ended
DEBT - Narrative (Details)	Jul. 30, 2026	Jul. 26, 2024 USD ($)	Jul. 17, 2024 USD ($)	Feb. 28, 2017	Sep. 30, 2024 USD ($)	Jun. 07, 2024 USD ($)	Jun. 05, 2024 USD ($)	May 07, 2024 USD ($)	Apr. 24, 2024 USD ($)	Mar. 27, 2024 USD ($)	Nov. 30, 2023 USD ($)	Nov. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 08, 2021 USD ($)
ABL Facility
Debt Instrument [Line Items]
Borrowing capacity		$ 500,000,000			$ 500,000,000.0
Borrowing base capacity					$ 538,800,000
Applicable margin (as a percent)					2.75%
Interest rate during period (as a percent)					7.70%
Unused portion under the facility					$ 349,200,000
ABL Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Amended and Restated ABL Facility: Summit Holdings’ asset based credit facility due July 2029					$ 800,000
ABL Facility \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Proceeds from sale of other assets		$ 50,000,000
Aggregate commitments (as percent)		10.00%
Interest coverage ratio					2.42
First lien net leverage ratio					0.84
ABL Facility \| Summit Holdings And Finance Corporation \| Minimum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Applicable margin (as a percent)		2.50%
ABL Facility \| Summit Holdings And Finance Corporation \| Minimum \| Base Rate
Debt Instrument [Line Items]
Applicable margin (as a percent)		1.50%
ABL Facility \| Summit Holdings And Finance Corporation \| Maximum
Debt Instrument [Line Items]
Net leverage ratio		2.50
Interest coverage ratio		2.00
ABL Facility \| Summit Holdings And Finance Corporation \| Maximum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Applicable margin (as a percent)		3.25%
ABL Facility \| Summit Holdings And Finance Corporation \| Maximum \| Base Rate
Debt Instrument [Line Items]
Applicable margin (as a percent)		2.25%
Credit Agreement
Debt Instrument [Line Items]
Borrowing capacity														$ 175,000,000
Applicable margin (as a percent)					2.475%
Interest rate during period (as a percent)					7.79%
Unused portion of the permian transmission credit facility					$ 4,500,000
Commitment fee (as a percent)					0.70%
Credit Agreement \| Summit Permian Transmission, LLC
Debt Instrument [Line Items]
Debt hedged by interest rate derivatives (as percent)					90.00%
Credit Agreement \| Summit Permian Transmission, LLC \| Interest Rate Contract
Debt Instrument [Line Items]
Applicable margin (as a percent)					1.23%
Credit Agreement \| Standby Letters of Credit
Debt Instrument [Line Items]
Unused portion of the permian transmission credit facility					$ 10,500,000
Credit Agreement \| Term Loan Credit Facility
Debt Instrument [Line Items]
Borrowing capacity														160,000,000
Credit Agreement \| Working Capital Credit Facility
Debt Instrument [Line Items]
Borrowing capacity														$ 15,000,000
Permian Transmission Term Loan: Summit Permian Transmission’s variable rate senior secured term loan due January 2028
Debt Instrument [Line Items]
Applicable margin (as a percent)					2.475%
Interest rate during period (as a percent)					7.79%
Senior Secured Second Lien Notes, 2029 \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Debt offering		$ 575,000,000
Stated interest rate (as a percent)		8.625%
Senior Secured Second Lien Notes, 2029 \| Summit Holdings And Finance Corporation \| Subsequent Event
Debt Instrument [Line Items]
Redemption percentage (as a percent)	40.00%
Redemption price (as percent)	108.625%
Senior Secured Second Lien Notes, 2029 \| Summit Holdings And Finance Corporation \| Subsequent Event \| Forecast
Debt Instrument [Line Items]
Redemption percentage (as a percent)	100.00%
2026 Notes
Debt Instrument [Line Items]
Debt offering												$ 85,000,000	$ 700,000,000
Stated interest rate (as a percent)													8.50%
Debt issued as a percent of face value												99.26%	98.50%
Secured Notes Indenture, 2026
Debt Instrument [Line Items]
Debt instrument, cash tender offer								$ 215,000,000		$ 19,300,000
Tendered and validly accepted and fully discharged amount									$ 13,600,000
Asset sale offer expired							$ 6,900,000
Secured Notes Indenture, 2026 \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Redemption price (as percent)		102.125%
Repayments of debt		$ 649,800,000
Debt instrument, notice of redemption on tender offer		114,700,000			$ 114,700,000
Debt instrument redemption irrevocable deposit		121,200,000
2026 Unsecured Notes
Debt Instrument [Line Items]
Debt offering											$ 209,500,000
2026 Unsecured Notes \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Debt instrument redemption notice amount						$ 209,500,000
2025 Senior Notes
Debt Instrument [Line Items]
Debt offering											180,000,000
Debt instrument, repurchase amount											29,500,000
Debt instrument, repurchased face amount											$ 29,700,000
2025 Senior Notes \| Summit Holdings And Finance Corporation \| Beginning October 15, 2025
Debt Instrument [Line Items]
Redemption price (as percent)				100.00%
Secured Notes Indenture, 2025 \| Summit Holdings And Finance Corporation
Debt Instrument [Line Items]
Redemption price (as percent)			100.00%
Debt instrument, cash tender offer			$ 49,800,000		$ 0
Debt instrument redemption irrevocable deposit		$ 50,600,000