v3.25.3

Debt - Narrative (Details) $ in Thousands	Jul. 24, 2025 USD ($)	Sep. 30, 2025 USD ($)	Jul. 24, 2025 EUR (€)
Debt Instrument [Line Items]
Outstanding letters of credit		$ 932
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, accordian percentage	100.00%		100.00%
Consolidated leverage ratio	3.50		3.50
Line of credit facility, fixed charge coverage ratio		1.25
Line of credit maximum quarterly increase	0.50		0.50
Long-term line of credit		$ 14,700
Capacity available under credit facility		$ 99,368
Line of credit facility, accordion feature, limit increase	$ 125,000
U.S. Term Loan Facility
Debt Instrument [Line Items]
Variable term loan, interest rate		5.66%
U.S. Term Loan Facility \| Guarantor Subsidiaries
Debt Instrument [Line Items]
Capital stock first lien assets, percentage	100.00%		100.00%
Capital stock first tier material foreign subsidiaries, percentage	65.00%
Loan Payable \| Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 115,000		€ 20,000,000
Long-term debt, term	5 years		5 years
Variable term loan, interest rate		5.66%
Line of credit facility, unused capacity, commitment fee percentage	0.25%
Loan Payable \| Line of Credit \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Loan Payable \| Line of Credit \| Canadian Overnight Repo Rate Average (CORRA)
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Loan Payable \| Line of Credit \| Euro Inter Bank Offered Rate (EURIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Loan Payable \| Line of Credit \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Loan Payable \| Line of Credit \| Canadian Prime Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Secured Debt \| U.S. Term Loan Facility \| Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 125,000
Long-term debt, term	5 years		5 years

Capital Stock First Lien Assets, Percentage

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Capital Stock First Tier Material Foreign Subsidiaries, Percentage

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Debt Instrument, Consolidated Leverage Ratio, Maximum

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Debt Instrument, Covenant, Leverage Ratio, Quarterly Increase, Maximum

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Debt Instrument, Fixed Charge Coverage Ratio, Minimum

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Line of Credit Facility, Accordion Feature, Increase Limit

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

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

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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.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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.

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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.

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

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Thermon Group Holdings, Inc. 10-Q