Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy Information (Details)

v3.22.0.1
Basis of Presentation and Accounting Policy Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Inventories, net $ 69,634   $ 69,634   $ 63,790  
Compensation cost     1,073      
Increase in compensation cost     107      
Cash and cash equivalents 32,566 $ 49,617 32,566 $ 49,617 40,124  
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 35,403 52,311 35,403 52,311 42,450 $ 46,006
Prepaid Expenses and Other Current Assets            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 2,496 2,314 2,496 2,314    
Other Assets            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 341 380 341 380    
Thermon Holding Corp.            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Accounts receivable, allowance for doubtful accounts (in dollars) 2,689   2,689   $ 2,074  
COVID-19            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Inventories, net 2 430 2 430    
COVID-19 | Marketing, general and administrative and engineering            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Adjustments to Income Statement 4 301 504 1,953    
COVID-19 | Cost of Sales            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Adjustments to Income Statement $ 199 $ 1,399 $ 1,448 $ 3,552