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Acquisitions and Disposals (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jul. 03, 2017
Dec. 12, 2016
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition [Line Items]            
Proceeds from Divestiture of Businesses     $ 3,885 $ 0 $ 0  
Adjustment for Final Working Capital Settlement         88  
Gain (Loss) on Disposition of Business     427 0 0  
Goodwill     93,368 $ 96,162 113,501 $ 78,293
Houston Interests, LLC [Member]            
Business Acquisition [Line Items]            
Adjustment for Final Working Capital Settlement   $ 6,837        
Net purchase price   $ 42,506        
Business Acquisition, Effective Date of Acquisition   Dec. 12, 2016        
Net assets acquired   $ 52,837        
Tax deductible goodwill   $ 35,146        
Settlement of warranty reserve $ 1,687          
Acquisition-related expenses         $ 600  
Process Heating Equipment Business [Member]            
Business Acquisition [Line Items]            
Proceeds from Divestiture of Businesses     4,000      
Adjustment for Final Working Capital Settlement     200      
Gain (Loss) on Disposition of Business     $ 400