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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Results of Operations
Gross revenues									$ 1,421,276	$ 1,097,738	$ 1,207,510
Less: Inter-segment revenues	$ 398,714	$ 358,887	$ 340,568	$ 318,511	$ 293,087	$ 245,645	$ 282,911	$ 269,910	1,416,680	1,091,553	1,197,509
Revenues	398,714	358,887	340,568	318,511	293,087	245,645	282,911	269,910	1,416,680	1,091,553	1,197,509
Gross profit	43,738	36,906	27,886	23,421	21,451	14,891	26,703	28,891	131,951	91,936	81,003
Operating income (loss)	17,389	$ 12,794	$ 5,527	$ 2,220	(17,112)	$ (5,862)	$ 5,174	$ 7,321	37,930	(10,479)	4,859
Segment assets	633,394				558,033				633,394	558,033	586,030
Capital expenditures									19,558	8,711	11,908
Depreciation and amortization									18,224	20,347	21,602
Electrical Infrastructure [Member]
Results of Operations
Gross revenues									217,417	255,931	373,384
Less: Inter-segment revenues									217,417	255,931	373,384
Revenues									217,417	255,931	373,384
Gross profit									15,470	18,300	7,137
Operating income (loss)									3,668	(16,531)	(8,309)
Segment assets	155,880				161,207				155,880	161,207	183,351
Capital expenditures									2,493	493	1,390
Depreciation and amortization									2,460	4,359	5,198
Oil Gas & Chemical [Member]
Results of Operations
Gross revenues									322,065	324,546	247,423
Less: Inter-segment revenues									319,867	322,772	240,523
Revenues									319,867	322,772	240,523
Gross profit									35,987	33,423	12,675
Operating income (loss)									12,984	8,798	(8,783)
Segment assets	91,959				111,064				91,959	111,064	129,177
Capital expenditures									2,736	1,514	829
Depreciation and amortization									4,661	5,904	6,299
Storage Solutions [Member]
Results of Operations
Gross revenues									524,330	319,106	483,254
Less: Inter-segment revenues									521,932	314,696	481,696
Revenues									521,932	314,696	481,696
Gross profit									56,011	25,778	55,651
Operating income (loss)									14,097	(5,907)	22,928
Segment assets	188,912				149,695				188,912	149,695	166,742
Capital expenditures									4,644	3,346	2,017
Depreciation and amortization									6,666	6,623	7,277
Industrial [Member]
Results of Operations
Gross revenues									357,464	198,155	103,449
Less: Inter-segment revenues									357,464	198,154	101,906
Revenues									357,464	198,154	101,906
Gross profit									24,483	14,435	5,540
Operating income (loss)									7,181	3,161	(977)
Segment assets	90,336				58,816				90,336	58,816	53,754
Capital expenditures									3,464	0	38
Depreciation and amortization									4,437	3,461	2,828
Unallocated Corporate [Member]
Results of Operations
Segment assets	$ 106,307				$ 77,251				106,307	77,251	53,006
Capital expenditures									6,221	3,358	7,634
Intersegment Eliminations [Member]
Results of Operations
Less: Inter-segment revenues									4,596	6,185	10,001
Revenues									4,596	6,185	10,001
Intersegment Eliminations [Member] | Electrical Infrastructure [Member]
Results of Operations
Less: Inter-segment revenues									0	0	0
Revenues									0	0	0
Intersegment Eliminations [Member] | Oil Gas & Chemical [Member]
Results of Operations
Less: Inter-segment revenues									2,198	1,774	6,900
Revenues									2,198	1,774	6,900
Intersegment Eliminations [Member] | Storage Solutions [Member]
Results of Operations
Less: Inter-segment revenues									2,398	4,410	1,558
Revenues									2,398	4,410	1,558
Intersegment Eliminations [Member] | Industrial [Member]
Results of Operations
Less: Inter-segment revenues									0	1	1,543
Revenues									$ 0	$ 1	$ 1,543

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