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Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2016
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 35,028    
Goodwill, Purchase Accounting Adjustments 88    
Translation adjustment [1] (390)    
Net balance at December 31, 2016 113,019    
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 [1] (227)    
Net balance at December 31, 2016 41,943    
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 28,723    
Goodwill, Purchase Accounting Adjustments 0    
Translation adjustment 0    
Net balance at December 31, 2016 42,731    
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 [1] (121)    
Net balance at December 31, 2016 16,648    
Industrial [Member]      
Goodwill [Line Items]      
Goodwill 5,434    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 5,434    
Goodwill, Acquired During Period 6,305    
Goodwill, Purchase Accounting Adjustments 0    
Translation adjustment [1] (42)    
Net balance at December 31, 2016 $ 11,697    
Baillie Tank Equipment, Ltd. [Member]      
Goodwill [Line Items]      
Goodwill     $ 7,030
Houston Interests, LLC [Member]      
Goodwill [Line Items]      
Goodwill   $ 35,028  
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