Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Narrative (Details)

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Apr. 01, 2015
Acquired Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 210,566 $ 122,521    
Amortization period 10 years 7 months 6 days      
Amortization of intangible assets $ 16,458 11,772 $ 12,112  
Net carrying amount 151,434 86,178    
Finite-Lived Intangible Assets, Net $ 107,152      
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      
Goodwill $ 13,249      
Amortization period 7 years 2 months 12 days      
Net carrying amount $ 5,278 $ 6,520    
Industrial Process Insulators, Inc. | Customer relationships        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization period   8 years    
Net carrying amount 3,975 $ 4,720    
Industrial Process Insulators, Inc. | Other Intangible Assets        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization period   3 years    
Net carrying amount $ 90 $ 359    
Sumac        
Acquired Finite-Lived Intangible Assets [Line Items]        
Goodwill       $ 7,992
Amortization period 3 years 7 months 18 days      
Debt instrument, face amount       $ 5,905
Net carrying amount $ 658 $ 1,276    
Sumac | Customer relationships        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization period   4 years    
Net carrying amount 658 $ 1,276    
Unitemp        
Acquired Finite-Lived Intangible Assets [Line Items]        
Trademarks carrying amount 474      
CHS Transactions        
Acquired Finite-Lived Intangible Assets [Line Items]        
Net carrying amount 151,434 86,178    
CHS Transactions | Developed Technology Rights        
Acquired Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Net 6,054 6,342    
CHS Transactions | Customer relationships        
Acquired Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Net 35,732 34,994    
CHS Transactions | Other Intangible Assets        
Acquired Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Net $ 1,974 $ 358