Operating Segments - Segment Summary (Details) $ in Thousands	3 Months Ended	6 Months Ended
Dec. 25, 2015 USD ($)	Dec. 26, 2014 USD ($)	Dec. 25, 2015 USD ($) segment	Dec. 26, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in segments) \| segment			4
Gross revenue	$ 157,743	$ 143,228	$ 293,202	$ 266,253
Net service revenue	111,382	99,838	211,545	192,457
Segment profit (loss)	6,698	6,866	14,371	12,858
Depreciation and amortization	2,780	2,641	5,044	4,906
Total [Member]
Segment Reporting Information [Line Items]
Gross revenue	156,288	142,273	294,163	266,463
Net service revenue	110,913	99,278	213,188	193,404
Segment profit (loss)	20,417	19,525	41,261	37,619
Depreciation and amortization	2,422	2,033	4,273	3,697
Energy
Segment Reporting Information [Line Items]
Gross revenue	48,040	43,289	88,246	81,921
Net service revenue	39,794	35,821	75,091	69,565
Segment profit (loss)	9,470	8,065	16,972	13,779
Depreciation and amortization	790	808	1,555	1,650
Environmental
Segment Reporting Information [Line Items]
Gross revenue	77,925	81,055	155,256	149,249
Net service revenue	51,424	52,555	104,474	100,211
Segment profit (loss)	9,548	10,152	19,838	20,310
Depreciation and amortization	938	1,111	1,927	1,823
Infrastructure
Segment Reporting Information [Line Items]
Gross revenue	22,306	17,929	42,644	35,293
Net service revenue	13,709	10,902	27,637	23,628
Segment profit (loss)	2,560	1,308	5,612	3,530
Depreciation and amortization	125	114	222	224
Pipeline Services
Segment Reporting Information [Line Items]
Gross revenue	8,017	0		0
Net service revenue	5,986	0		0
Segment profit (loss)	(1,161)	0		0
Depreciation and amortization	$ 569	$ 0	$ 569	$ 0

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Aggregate revenue during the period for services rendered in the normal course of business (before deducting allowances and discounts) which are not otherwise defined in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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