Operating Segments - Segment Summary (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 26, 2014	Dec. 27, 2013	Dec. 26, 2014 segment	Dec. 27, 2013
Segment Reporting Information [Line Items]
Number of operating segments (in segments)			3us-gaap_NumberOfOperatingSegments
Sales Revenue, Services, Other	$ 143,228us-gaap_SalesRevenueServicesGross	$ 122,592us-gaap_SalesRevenueServicesGross	$ 266,253us-gaap_SalesRevenueServicesGross	$ 229,166us-gaap_SalesRevenueServicesGross
Net service revenue	99,838us-gaap_SalesRevenueServicesNet	91,131us-gaap_SalesRevenueServicesNet	192,457us-gaap_SalesRevenueServicesNet	172,383us-gaap_SalesRevenueServicesNet
Segment profit	6,866us-gaap_OperatingIncomeLoss	5,195us-gaap_OperatingIncomeLoss	12,858us-gaap_OperatingIncomeLoss	9,449us-gaap_OperatingIncomeLoss
Depreciation and amortization	2,641	2,250	4,906	4,426
Total [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	142,116	122,607	266,176	227,981
Net service revenue	99,138	90,902	193,140	170,655
Segment profit	19,477	18,083	37,535	34,341
Depreciation and amortization	2,033	1,626	3,697	3,168
Energy
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	42,446	40,106	80,481	73,570
Net service revenue	35,163	34,893	68,376	63,707
Segment profit	7,907	7,301	13,548	11,405
Depreciation and amortization	804	792	1,643	1,550
Environmental
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	81,055	66,420	149,249	121,942
Net service revenue	52,555	44,560	100,211	82,921
Segment profit	10,152	8,764	20,310	18,111
Depreciation and amortization	1,111	726	1,823	1,406
Infrastructure
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	18,615	16,081	36,446	32,469
Net service revenue	11,420	11,449	24,553	24,027
Segment profit	1,418	2,018	3,677	4,825
Depreciation and amortization	$ 118	$ 108	$ 231	$ 212

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=31042434&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=26872669&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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