Operating Segments - Segment Summary (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Sep. 27, 2013 segment	Sep. 28, 2012
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	$ 106,574	$ 108,286
Number of operating segments (in segments)	3
Net service revenue	81,252	75,216
Segment profit	4,254	4,606
Depreciation and amortization	2,176	1,538
Total [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	105,374	106,858
Net service revenue	79,753	74,265
Segment profit	16,258	14,982
Depreciation and amortization	1,542	996
Energy
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	33,464	32,174
Net service revenue	28,814	25,643
Segment profit	4,104	6,000
Depreciation and amortization	758	333
Environmental
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	55,522	58,599
Net service revenue	38,361	37,376
Segment profit	9,347	6,915
Depreciation and amortization	680	541
Infrastructure
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	16,388	16,085
Net service revenue	12,578	11,246
Segment profit	2,807	2,067
Depreciation and amortization	$ 104	$ 122

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=6943989&loc=d3e3602-108585

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- Definition

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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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

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.

+ References

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=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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