Annual report pursuant to Section 13 and 15(d)

Organization and Summary of Significant Accounting Policies (Details)

v3.4.0.3
Organization and Summary of Significant Accounting Policies (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2010
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Business Acquisition [Line Items]                        
Selling, General and Administrative Expense                   $ 80,729 $ 76,868 $ 65,463
Goodwill impaired                   (1,240)    
Cost of selling controlling interest $ 129,252                      
Sales           $ 74,256 $ 87,622 $ 79,033 $ 67,667 281,928 308,578 277,323
Gross Profit   $ 32,095 $ 35,129 $ 33,354 $ 30,737 $ 34,105 $ 45,533 $ 41,221 33,845 131,315 154,704 135,170
Net cash provided by (used in) operations                   47,920 51,731 46,114
Non-U.S.                   $ 19,304 $ 40,069 $ 39,078
Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries   58.00%       56.00%       58.00% 56.00%  
Entity Wide Disclosure On Geographic Areas, Revenue From External Customers Attributed To Foreign Countries, Percentage                   55.00% 63.00% 67.00%
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Amortization of Deferred Charges                   $ 732 $ 464 $ 4,572
Research and Development Expense                   3,338 2,907 3,008
Debt issuance costs, net   $ 888       $ 1,217       $ 888 1,217  
Group of investors and other private equity firms [Member]                        
Business Acquisition [Line Items]                        
Number of other private equity firms 2                      
Land Improvements [Member] | Minimum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   15 years    
Land Improvements [Member] | Maximum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   20 years    
Building and Building Improvements [Member] | Minimum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   10 years    
Building and Building Improvements [Member] | Maximum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   40 years    
Machinery and equipment [Member] | Minimum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   3 years    
Machinery and equipment [Member] | Maximum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   25 years    
Furniture and Fixtures [Member] | Minimum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   3 years    
Furniture and Fixtures [Member] | Maximum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   10 years    
Software Development [Member] | Minimum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   5 years    
Software Development [Member] | Maximum [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Property, Plant and Equipment, Estimated Useful Lives                   7 years    
Allowance for Doubtful Accounts [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Balance, beginning of period         785       1,141 $ 785 751 1,141
Reductions to expense                   214    
Additions charged to expense                     175 (175)
Write-off of uncollectible accounts                   (343) (141) (215)
Balance, end of period   656       785       656 785 751
Inventory Valuation Reserve [Member]                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Balance, beginning of period         $ 1,116       $ 1,076 1,116 893 1,076
Reductions to expense                   212 56 54
Additions charged to expense                   383 279 (129)
Balance, end of period   1,287       1,116       1,287 1,116 $ 893
Predecessor [Member] | Group of investors and other private equity firms [Member] | Thermon Holding Corp. [Member]                        
Business Acquisition [Line Items]                        
Fair value of total consideration transferred $ 321,500                      
Consideration transferred, liabilities incurred $ 210,000                      
Correction of Marketing, General and Administrative and Engineering Expense                        
Business Acquisition [Line Items]                        
Selling, General and Administrative Expense                   498    
Accounting Standards Update 2015-07                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Deferred tax assets, current   (3,549)               (3,549)    
Other Long-term Assets | Accounting Standards Update 2015-03                        
Movement in Valuation Allowances and Reserves [Roll Forward]                        
Debt issuance costs, net   $ 79       $ 141       $ 79 $ 141