Quarterly report pursuant to Section 13 or 15(d)

Cover Page

Cover Page - shares
3 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Cover page.    
Title of 12(b) Security Common Stock, $0.001 par value per share  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 001-35159  
Entity Registrant Name THERMON GROUP HOLDINGS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number   27-2228185  
Entity Address, Address Line One 7171 Southwest Parkway  
Entity Address, Address Line Two Building 300  
Entity Address, Address Line Three Suite 200  
Entity Address, City or Town Austin  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 78735  
City Area Code 512  
Local Phone Number 690-0600  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   32,728,876
Entity Central Index Key 0001489096  
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Trading Symbol THR  
Security Exchange Name NYSE