Thermon Group Holdings, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

Long-Term Debt - Narrative (Details)

Long-Term Debt - Narrative (Details) $ in Thousands		12 Months Ended
Long-Term Debt - Narrative (Details) $ in Thousands	Jul. 24, 2025 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Jul. 24, 2025 EUR (€)
Debt Instrument [Line Items]
Amortization of deferred charges		$ 497	$ 486	$ 489
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, accordion feature, limit increase	$ 125,000
Line of credit facility, accordion percentage	100.00%				100.00%
Consolidated leverage ratio	3.50				3.50
Line of credit maximum quarterly increase	0.50				0.50
Line of credit maximum quarterly increase		1.25
Capacity available under credit facility		$ 94,287
Outstanding letters of credit		1,013
U.S. Term Loan Facility \| Thermon Manufacturing Company and US Subsidiaries (Guarantor)
Debt Instrument [Line Items]
Capital stock first lien assets, percentage	100.00%				100.00%
Capital stock first tier material foreign subsidiaries, percentage	65.00%
Credit Agreement
Debt Instrument [Line Items]
Debt issuance costs		$ 759
Variable Rate Term Loan due October 2024
Debt Instrument [Line Items]
Variable term loan, interest rate		5.17%
Revolving Credit Facility \| 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
Line of credit facility, unused capacity, commitment fee percentage	0.25%
Revolving Credit Facility \| Line of Credit \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Revolving Credit Facility \| Line of Credit \| Canadian Prime Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Revolving Credit Facility \| Line of Credit \| Canadian Overnight Repo Rate Average
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Revolving Credit Facility \| Line of Credit \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Revolving Credit Facility \| Line of Credit \| Euro Inter Bank Offered Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
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