Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Narrative (Details)

v3.20.1
Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 197,978 $ 204,995  
Amortization of intangible assets 17,773 20,771 $ 16,458
Net carrying amount 104,546 126,596  
Finite-Lived Intangible Assets, Net $ 62,381    
CHS Transactions      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 12 years    
CHS Transactions | Developed Technology Rights      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 20 years    
CHS Transactions | Product [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 10 years    
CHS Transactions | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 10 years    
CHS Transactions | Other Intangible Assets      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 6 years    
THS Transactions [Member] | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount, finite-lived intangibles $ 58,722    
Amortization period 17 years    
Industrial Process Insulators, Inc.      
Acquired Finite-Lived Intangible Assets [Line Items]      
Trademarks carrying amount $ 1,820    
Unitemp      
Acquired Finite-Lived Intangible Assets [Line Items]      
Trademarks carrying amount 314    
CHS Transactions      
Acquired Finite-Lived Intangible Assets [Line Items]      
Net carrying amount 104,546 126,596  
CHS Transactions | Developed Technology Rights      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount, finite-lived intangibles 9,564 9,854  
Finite-Lived Intangible Assets, Net 4,806 5,390  
CHS Transactions | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount, finite-lived intangibles 105,912 110,802  
Finite-Lived Intangible Assets, Net 12,183 23,483  
CHS Transactions | Other Intangible Assets      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount, finite-lived intangibles 0 5,742  
Finite-Lived Intangible Assets, Net $ 0 $ 0