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Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) - USD ($)
$ in Thousands
 9 Months Ended
Mar. 31, 2017
Dec. 12, 2016
Feb. 01, 2016
Goodwill [Line Items]      
Goodwill $ 78,293    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 78,293    
Goodwill, Acquired During Period 35,048    
Goodwill, Purchase Accounting Adjustments 88    
Translation adjustment (247)    
Net balance at March 31, 2017 113,182    
Electrical Infrastructure [Member]      
Goodwill [Line Items]      
Goodwill 42,170    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 42,170    
Goodwill, Acquired During Period 0    
Goodwill, Purchase Accounting Adjustments 0    
Translation adjustment (175)    
Net balance at March 31, 2017 41,995    
Oil Gas & Chemical [Member]      
Goodwill [Line Items]      
Goodwill 14,008    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 14,008    
Goodwill, Acquired During Period 28,739    
Goodwill, Purchase Accounting Adjustments 0    
Translation adjustment 0    
Net balance at March 31, 2017 42,747    
Storage Solutions [Member]      
Goodwill [Line Items]      
Goodwill 16,681    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 16,681    
Goodwill, Acquired During Period 0    
Goodwill, Purchase Accounting Adjustments 88    
Translation adjustment (39)    
Net balance at March 31, 2017 16,730    
Industrial [Member]      
Goodwill [Line Items]      
Goodwill 5,434    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 5,434    
Goodwill, Acquired During Period 6,309    
Goodwill, Purchase Accounting Adjustments 0    
Translation adjustment (33)    
Net balance at March 31, 2017 $ 11,710    
Baillie Tank Equipment, Ltd. [Member]      
Goodwill [Line Items]      
Goodwill     $ 7,030
Houston Interests, LLC [Member]      
Goodwill [Line Items]      
Goodwill   $ 35,048