Quarterly report pursuant to Section 13 or 15(d)

Restructuring and other charges (income) - Narrative (Details)

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Restructuring and other charges (income) - Narrative (Details)
3 Months Ended 6 Months Ended 9 Months Ended
Dec. 15, 2020
USD ($)
Dec. 15, 2020
ZAR (R)
Dec. 31, 2021
USD ($)
positions
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
positions
Dec. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Restructuring Cost and Reserve [Line Items]                
Number of positions eliminated | positions     66     262    
Severance costs     $ 997,000     $ 5,858,000    
Lease impairment costs       $ 429,000        
Abandonment expense       $ 144,000     $ 191,000  
Sale of stock, consideration received on transaction $ 167,000 R 2,500            
Loss on disposition of business           (310,000) $ (2,045,000)  
Accumulated other comprehensive loss     $ (39,871,000)     $ (39,871,000)   $ (35,919,000)
Thermon South Africa Proprieary Limited                
Restructuring Cost and Reserve [Line Items]                
Cash receipts         $ 311,000      
Sale of stock, percentage of ownership before transaction 100.00% 100.00%            
Loss on disposition of business $ 2,214,000              
Accumulated other comprehensive loss $ 828,000