Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Acquisition Consideration (Details)

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Goodwill and Other Intangible Assets - Acquisition Consideration (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2015
Apr. 01, 2015
Mar. 02, 2015
Sep. 30, 2015
Sep. 30, 2015
Mar. 31, 2015
Business Acquisition [Line Items]            
Goodwill       $ 122,722 $ 122,722 $ 105,232
Industrial Process Insulators, Inc.            
Business Acquisition [Line Items]            
Transactions Costs       $ 33 $ 33  
Business Acquisition, Percentage of Voting Interests Acquired 100.00%          
Goodwill $ 10,204          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life         9 years  
Consideration to or on behalf of sellers at close 21,750          
Fair value of total consideration transferred $ 21,750          
Sumac Fabrication Company Limited            
Business Acquisition [Line Items]            
Transactions Costs         $ 134  
Business Acquisition, Percentage of Voting Interests Acquired   75.00%        
Goodwill   $ 9,255        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       4 years 6 months    
Consideration to or on behalf of sellers at close   10,956        
Fair value of total consideration transferred   $ 10,956        
Unitemp            
Business Acquisition [Line Items]            
Transactions Costs         $ 34  
Goodwill     $ 1,630      
Consideration to or on behalf of sellers at close     3,890      
Fair value of total consideration transferred     $ 3,890