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Acquisitions (Schedule of Allocation of purchase price consideration) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Allocation of purchase price consideration (in thousands):      
Goodwill $ 37,061 $ 24,753
Western State Design [Member]      
Allocation of purchase price consideration (in thousands):      
Accounts receivable 8,597    
Inventory 3,429    
Other assets 2,623    
Property, plant and equipment 879    
Intangible assets 6,464    
Accounts payable and accrued expenses (6,549)    
Customer deposits (4,247)    
Billings in excess of costs on uncompleted contracts (3,888)    
Total identifiable net assets 7,308    
Goodwill 22,139    
Total 29,447    
Tri-State Technical Services [Member]      
Allocation of purchase price consideration (in thousands):      
Accounts receivable 3,416    
Inventory 3,050    
Other assets 1,565    
Property, plant and equipment 805    
Intangible assets 5,200    
Accounts payable and accrued expenses (2,220)    
Customer deposits (1,289)    
Total identifiable net assets 10,527    
Goodwill 4,974    
Total 15,501    
AA Acquisition [Member]      
Allocation of purchase price consideration (in thousands):      
Accounts receivable 2,850    
Inventory 2,816    
Other assets 2,966    
Property, plant and equipment 771    
Intangible assets 4,300    
Accounts payable and accrued expenses (1,228)    
Customer deposits (285)    
Total identifiable net assets 12,190    
Goodwill 7,334    
Total $ 19,524