Acquisitions (Schedule of Allocation of purchase price consideration) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Allocation of purchase price consideration (in thousands):
Goodwill	$ 37,051	$ 24,753
Tri-State Technical Services [Member]
Allocation of purchase price consideration (in thousands):
Accounts receivable	3,416
Inventory	2,747
Other assets	1,565
Property, plant and equipment	806
Intangible assets	5,200
Accounts payable and accrued expenses	(2,220)
Customer deposits	(1,289)
Total identifiable net assets	10,225
Goodwill	4,980
Total	15,205
AA Acquisition [Member]
Allocation of purchase price consideration (in thousands):
Accounts receivable	2,834
Inventory	2,833
Other assets	2,950
Property, plant and equipment	771
Intangible assets	4,300
Accounts payable and accrued expenses	(1,197)
Customer deposits	(285)
Total identifiable net assets	12,206
Goodwill	7,318
Total	$ 19,524