Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details)

v3.21.2
Long-Term Debt (Details)
$ in Thousands
 3 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2020
Oct. 30, 2017
USD ($)
Oct. 30, 2017
CAD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Apr. 01, 2018
Debt Instrument [Line Items]                
Less current portion $ (2,500,000)       $ (2,500,000)   $ (2,500,000)  
Long-term debt, net 142,601,000       142,601,000   143,017,000  
Repayments of long-term debt         8,759,000 $ 34,294,000    
Maximum leverage ratio to secure additional borrowing     4.0 4.0        
Revolving credit facility                
Debt Instrument [Line Items]                
Repayments of lines of credit 7,959,000       8,134,000      
Capacity available under credit facility $ 56,213,000       56,213,000      
Through March 31, 2019 | Loans Payable                
Debt Instrument [Line Items]                
Repayments of notes payable         $ 625      
Revolving credit facility | Line of Credit                
Debt Instrument [Line Items]                
Debt Instrument, face amount     $ 60,000,000          
Long-term Debt, Term     5 years          
Repayments of lines of credit     $ 6,000,000          
Liabilities incurred       $ 201,900        
Line of credit facility, commitment fee percentage     0.50% 0.50%        
Maximum leverage ratio   3.75            
Debt covenant, coverage ratio     1.25 1.25        
Revolving credit facility | Base Rate | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate     2.25% 2.25%        
Revolving credit facility | London Interbank Offered Rate (LIBOR) | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate     3.25% 3.25%        
Revolving credit facility | Canadian Base Rate | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate     2.25% 2.25%        
Revolving credit facility | CDOR | Line of Credit                
Debt Instrument [Line Items]                
Basis spread on variable rate     3.25% 3.25%        
Variable Rate Term Loan due October 2024                
Debt Instrument [Line Items]                
Variable term loan, interest rate 4.75%       4.75%      
Variable Rate Term Loan due October 2024 | Loans Payable                
Debt Instrument [Line Items]                
Variable Rate Term Loans $ 145,101,000       $ 145,101,000   145,517,000  
Debt issuance costs, net $ 3,719,000       $ 3,719,000   $ 4,447,000  
Variable Rate Senior Secured Term Loan B | Secured Debt                
Debt Instrument [Line Items]                
Debt Instrument, face amount     $ 250,000,000          
Long-term Debt, Term     7 years          
Variable interest rate floor     1.00%          
Quarterly amortization of debt, percent               0.25%
Repayment requirement, percentage of excess cash flow         50.00%      
Reduced repayment requirement, percentage of excess cash flow         25.00%      
Maximum leverage ratio requirement for reduced payment         4.0      
Minimum leverage ratio requirement for reduced payment         3.5      
Minimum repayment requirement percentage of excess cash flow         0.00%      
Maximum leverage ratio requirement for minimum repayment         3.5      
Maximum leverage ratio         3.5      
Additional borrowing capacity     $ 30,000,000          
Variable Rate Senior Secured Term Loan B | Secured Debt | Subsidiary Stock                
Debt Instrument [Line Items]                
Guarantor obligations, percentage     100.00% 100.00%        
Variable Rate Senior Secured Term Loan B | Secured Debt | Stock of First Tier Material Foreign Subsidiaries, US Borrower, and US Subsidiary                
Debt Instrument [Line Items]                
Guarantor obligations, percentage     65.00% 65.00%        
Variable Rate Senior Secured Term Loan B | Base Rate | Secured Debt                
Debt Instrument [Line Items]                
Basis spread on variable rate     2.75% 2.75%        
Variable Rate Senior Secured Term Loan B | London Interbank Offered Rate (LIBOR) | Secured Debt                
Debt Instrument [Line Items]                
Basis spread on variable rate     3.75% 3.75%        
Term Loan A due April 2019                
Debt Instrument [Line Items]                
Repayments of long-term debt     $ 70,875,000          
Thermon Heating Systems Inc.                
Debt Instrument [Line Items]                
Debt proceeds used as consideration for business acquisition     $ 164,900,000