Thermon Group Holdings, Inc. Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts with Customers - Disaggregation of Revenue (Details)

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 412,642	$ 308,609	$ 264,130
Revenues recognized at point in time
Disaggregation of Revenue [Line Items]
Total revenues	247,606
Revenues recognized over time
Disaggregation of Revenue [Line Items]
Total revenues	165,036
United States and Latin America
Disaggregation of Revenue [Line Items]
Total revenues	165,648
United States and Latin America \| Revenues recognized at point in time
Disaggregation of Revenue [Line Items]
Total revenues	71,865
United States and Latin America \| Revenues recognized over time
Disaggregation of Revenue [Line Items]
Total revenues	93,783
Canada
Disaggregation of Revenue [Line Items]
Total revenues	127,392
Canada \| Revenues recognized at point in time
Disaggregation of Revenue [Line Items]
Total revenues	102,997
Canada \| Revenues recognized over time
Disaggregation of Revenue [Line Items]
Total revenues	24,395
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	77,508
Europe, Middle East and Africa \| Revenues recognized at point in time
Disaggregation of Revenue [Line Items]
Total revenues	46,210
Europe, Middle East and Africa \| Revenues recognized over time
Disaggregation of Revenue [Line Items]
Total revenues	31,298
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	42,094
Asia-Pacific \| Revenues recognized at point in time
Disaggregation of Revenue [Line Items]
Total revenues	26,534
Asia-Pacific \| Revenues recognized over time
Disaggregation of Revenue [Line Items]
Total revenues	$ 15,560