Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.8.0.1
Document and Entity Information - USD ($)
12 Months Ended
Mar. 31, 2018
May 25, 2018
Sep. 30, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name Thermon Group Holdings, Inc.    
Entity Central Index Key 0001489096    
Current Fiscal Year End Date --03-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Mar. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   32,497,992  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 576,947,503