Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Carrying value of goodwill by segment
Goodwill				$ 55,836
Cumulative impairment loss				(25,000)
Net Goodwill	$ 71,518	$ 69,837	$ 30,836
Acquisition Related Adjustment for Final Working Capital Settlement		219
Goodwill resulting from purchase	6,942	3,065	39,076
Translation adjustment	(167)	(1,603)	(75)
Net Goodwill	78,293	71,518	69,837
Electrical Infrastructure [Member]
Carrying value of goodwill by segment
Goodwill				29,666
Cumulative impairment loss				(17,653)
Net Goodwill	42,374	43,243	12,013
Acquisition Related Adjustment for Final Working Capital Settlement		175
Goodwill resulting from purchase	0	0	31,259
Translation adjustment	(204)	(1,044)	(29)
Net Goodwill	42,170	42,374	43,243
Oil Gas & Chemical [Member]
Carrying value of goodwill by segment
Goodwill				8,088
Cumulative impairment loss				(3,000)
Net Goodwill	14,008	10,943	5,088
Acquisition Related Adjustment for Final Working Capital Settlement		0
Goodwill resulting from purchase	0	3,065	5,855
Translation adjustment	0	0	0
Net Goodwill	14,008	14,008	10,943
Storage Solutions [Member]
Carrying value of goodwill by segment
Goodwill				10,985
Cumulative impairment loss				(922)
Net Goodwill	9,664	10,027	10,063
Acquisition Related Adjustment for Final Working Capital Settlement		0
Goodwill resulting from purchase	6,942	0	0
Translation adjustment	75	(363)	(36)
Net Goodwill	16,681	9,664	10,027
Industrial [Member]
Carrying value of goodwill by segment
Goodwill				7,097
Cumulative impairment loss				$ (3,425)
Net Goodwill	5,472	5,624	3,672
Acquisition Related Adjustment for Final Working Capital Settlement		44
Goodwill resulting from purchase	0	0	1,962
Translation adjustment	(38)	(196)	(10)
Net Goodwill	$ 5,434	$ 5,472	$ 5,624