Operating Segments - Segment Summary (Details) $ in Thousands	3 Months Ended	4 Months Ended	9 Months Ended
Mar. 25, 2016 USD ($)	Mar. 27, 2015 USD ($)	Mar. 25, 2016 USD ($)	Mar. 25, 2016 USD ($) segment	Mar. 27, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in segments) \| segment				4
Gross revenue	$ 158,130	$ 130,777		$ 451,332	$ 397,030
Net service revenue	121,253	100,994		332,798	293,451
Segment profit (loss)	(23,302)	7,149		(8,931)	20,007
Acquisition and integration expenses	1,606	0		3,724	0
Total [Member]
Segment Reporting Information [Line Items]
Gross revenue	156,992	129,152		451,155	395,615
Net service revenue	120,593	100,093		333,781	293,498
Segment profit (loss)	15,403	21,411		56,664	59,030
Acquisition and integration expenses	1,171
Depreciation	1,726	1,091		4,435	3,525
Amortization	2,993	681		4,558	1,945
Energy
Segment Reporting Information [Line Items]
Gross revenue	46,280	42,404		134,526	124,325
Net service revenue	35,974	37,056		111,065	106,621
Segment profit (loss)	8,048	8,796		25,020	22,575
Depreciation	473	455		1,431	1,478
Amortization	260	282		858	909
Environmental
Segment Reporting Information [Line Items]
Gross revenue	65,465	70,711		220,721	219,960
Net service revenue	50,023	51,172		154,497	151,384
Segment profit (loss)	7,922	9,942		27,760	30,252
Depreciation	615	542		1,877	1,728
Amortization	279	399		944	1,036
Infrastructure
Segment Reporting Information [Line Items]
Gross revenue	18,721	16,037		61,365	51,330
Net service revenue	13,036	11,865		40,673	35,493
Segment profit (loss)	2,561	2,673		8,173	6,203
Depreciation	119	94		341	319
Amortization	0	0		0	0
Pipeline Services
Segment Reporting Information [Line Items]
Gross revenue	26,526	0	$ 34,543		0
Net service revenue	21,560	0	$ 27,546		0
Segment profit (loss)	(3,128)	0			0
Acquisition and integration expenses	1,171			1,171
Depreciation	519	0		786	0
Amortization	$ 2,454	$ 0		$ 2,756	$ 0

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
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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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The net result for the period of deducting operating expenses from operating 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))
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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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