Annual report pursuant to Section 13 and 15(d)

Acquisitions - Provisional (Details)

v3.8.0.1
Acquisitions - Provisional (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]    
Deferred income taxes $ 34,252 $ 25,661
Industrial Process Insulators, Inc.    
Business Acquisition [Line Items]    
Customer relationships   10,720
Goodwill   10,204
Deferred income taxes   4,962
Final Fair Value | Industrial Process Insulators, Inc.    
Business Acquisition [Line Items]    
Customer relationships   5,962
Goodwill   13,249
Deferred income taxes   $ 3,249