Operating Segments - Segment Summary (Details) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2017 USD ($)	Mar. 25, 2016 USD ($)	Mar. 31, 2017 USD ($) segment	Mar. 25, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in segments) \| segment			4
Gross revenue	$ 189,724	$ 158,130	$ 569,237	$ 451,332
Net service revenue	128,725	121,253	380,386	332,798
Segment profit (loss)	7,010	(23,302)	20,003	(8,931)
Acquisition and integration expenses	0	1,606	0	3,724
Total [Member]
Segment Reporting Information [Line Items]
Gross revenue	188,977	156,992	566,406	448,330
Net service revenue	128,090	120,593	378,617	330,971
Segment profit (loss)	23,008	15,379	69,332	55,954
Acquisition and integration expenses		1,171
Depreciation	1,504	1,726	4,626	4,435
Amortization	2,687	2,993	7,767	4,558
Energy
Segment Reporting Information [Line Items]
Gross revenue	69,074	46,280	193,929	133,556
Net service revenue	41,282	35,974	118,670	110,106
Segment profit (loss)	9,110	8,049	26,578	24,831
Depreciation	435	473	1,316	1,431
Amortization	608	260	1,101	858
Environmental
Segment Reporting Information [Line Items]
Gross revenue	73,557	65,465	227,655	219,233
Net service revenue	49,855	50,023	149,074	153,011
Segment profit (loss)	8,651	7,922	26,887	27,451
Depreciation	628	615	1,929	1,877
Amortization	237	279	765	944
Infrastructure
Segment Reporting Information [Line Items]
Gross revenue	18,518	18,721	62,873	60,998
Net service revenue	14,673	13,036	45,922	40,308
Segment profit (loss)	3,202	2,536	10,984	7,961
Depreciation	141	119	418	341
Amortization	0	0	0	0
Oil & Gas
Segment Reporting Information [Line Items]
Gross revenue	27,828	26,526	81,949	34,543
Net service revenue	22,280	21,560	64,951	27,546
Segment profit (loss)	2,045	(3,128)		(4,289)
Acquisition and integration expenses		1,171		1,171
Depreciation	300	519	963	786
Amortization	$ 1,842	$ 2,454	$ 5,901	$ 2,756

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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