Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy Information (Details)

v2.4.0.6
Basis of Presentation and Accounting Policy Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Apr. 30, 2010
Business Acquisition [Line Items]                    
Sales $ 76,750 $ 67,671 $ 67,530 $ 69,197 $ 68,351 $ 64,935 $ 211,951 $ 202,483    
Net cash used in operating activities     357       (26,144) 6,481 3,112  
Net cash used in investing activities     (5,706)       (5,448) (6,842) (22,671)  
Cost of Goods Sold   35,032 34,191 35,506 36,400 32,946        
Gross Profit 34,951 32,639 33,339 33,691 31,951 31,989 100,929 97,631    
Gross profit as a percentage of revenue   48.20% 49.40% 48.70% 46.70% 49.30%        
Scenario, Previously Reported
                    
Business Acquisition [Line Items]                    
Sales   67,358 67,213 68,837 68,023 64,618        
Net cash used in operating activities     1,600           5,293  
Net cash used in investing activities     (6,949)           (24,852)  
Cost of Goods Sold   34,719 33,874 35,146 36,072 32,629        
Gross Profit   32,639 33,339 33,691 31,951 31,989        
Gross profit as a percentage of revenue   48.50%   48.90% 47.00% 49.50%        
Restatement Adjustment
                    
Business Acquisition [Line Items]                    
Sales   313 317 360 328 317        
Net cash used in operating activities     (1,243)           (2,181)  
Net cash used in investing activities     1,243           2,181  
Thermon Holding Corp.
                    
Business Acquisition [Line Items]                    
Sales 76,750 67,671 67,530 69,197 68,351 64,935 211,951 202,483    
Purchase price to acquire the controlling interest                   210,000
Cost of selling controlling interest                   129,252
Net cash used in operating activities     (357)       (26,144) 6,481 (3,112)  
Net cash used in investing activities     (5,706)       (5,448) (6,842) (22,671)  
Cost of Goods Sold   35,032 34,191 35,506 36,400 32,946        
Gross Profit 34,951 32,639 33,339 33,691 31,951 31,989 100,929 97,631    
Gross profit as a percentage of revenue   48.20% 49.40% 48.70% 46.70% 49.30%        
Thermon Holding Corp. | Scenario, Previously Reported
                    
Business Acquisition [Line Items]                    
Sales   67,358 67,213 68,837 68,023 64,618        
Net cash used in operating activities     (1,600)           (5,293)  
Net cash used in investing activities     (6,949)           (24,852)  
Cost of Goods Sold   34,719 33,874 35,146 36,072 32,629        
Gross Profit   32,639 33,339 33,691 31,951 31,989        
Gross profit as a percentage of revenue   48.50% 49.60% 48.90% 47.00% 49.50%        
Thermon Holding Corp. | Restatement Adjustment
                    
Business Acquisition [Line Items]                    
Sales   313 317 360 328 317        
Net cash used in operating activities     1,243           2,181  
Net cash used in investing activities     1,243           2,181  
Thermon Holding Corp. | Group of investors and other private equity firms
                    
Business Acquisition [Line Items]                    
Number of other private equity firms                   2
Thermon Holding Corp. | Group of investors and other private equity firms | Thermon Holding Corp. | Predecessor
                    
Business Acquisition [Line Items]                    
Purchase price to acquire the controlling interest                   $ 321,500