Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Narrative (Details)

v3.19.2
Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 204,995 $ 210,566  
Amortization period 10 years 7 months 6 days    
Amortization of intangible assets $ 20,771 16,458 $ 11,772
Net carrying amount 126,596 151,434  
Finite-Lived Intangible Assets, Net $ 83,549    
CHS Transactions      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 10 years    
CHS Transactions | Developed Technology Rights      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization period 20 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    
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 387    
CHS Transactions      
Acquired Finite-Lived Intangible Assets [Line Items]      
Net carrying amount 126,596 151,434  
CHS Transactions | Developed Technology Rights      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 5,390 6,054  
CHS Transactions | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 23,483 35,732  
CHS Transactions | Other Intangible Assets      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 0 $ 1,974