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