Annual report pursuant to Section 13 and 15(d)

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

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Restructuring and other charges (income) - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 15, 2020
USD ($)
Dec. 15, 2020
ZAR (R)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Positions
Restructuring Cost and Reserve [Line Items]                
Costs incurred           $ 3,693,000 $ (414,000) $ 8,623,000
Severance costs               $ 5,748,000
Number of positions eliminated | Positions               252
Lease impairment costs $ 429,000              
Lease abandonment charges $ 381,000              
Sale of stock, consideration received on transaction   $ 167,000 R 2,500,000          
Loss on disposition of business           0 (306,000) $ (2,065,000)
Accumulated other comprehensive loss       $ (58,100,000)   (58,100,000) $ (38,906,000)  
Canada                
Restructuring Cost and Reserve [Line Items]                
Cost of revenue           241,000    
Thermon South Africa Proprieary Limited                
Restructuring Cost and Reserve [Line Items]                
Less cash payments           (311,000)    
Sale of stock, percentage of ownership before transaction   100.00% 100.00%          
Loss on disposition of business               2,065,000
Accumulated other comprehensive loss               $ 828,000
Russia                
Restructuring Cost and Reserve [Line Items]                
Costs incurred       8,334,000   12,638,000    
Legal fees       $ 209,000   $ 282,000    
Canada                
Restructuring Cost and Reserve [Line Items]                
Severance costs         $ 103,000