Operating Segments - Segment Detail (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 26, 2014	Sep. 27, 2013
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	$ 123,025	$ 106,574
Net service revenue	92,619	81,252
Operating income (loss)	5,992	4,254
Corporate shared services(2)	(10,298)	(10,215)
Allocated Share-based Compensation Expense	(1,167)	(1,155)
Depreciation and amortization	(2,265)	(2,176)
Interest expense	(31)	(92)
Income from operations before taxes	5,961	4,162
Operating Segments
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	124,060	105,374
Net service revenue	94,002	79,753
Operating income (loss)	18,058	16,258
Depreciation and amortization	(1,664)	(1,542)
Reconciling Items
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	(1,035)	1,200
Net service revenue	(1,383)	1,499
Depreciation and amortization	(601)	(634)
Energy
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	38,035	33,464
Net service revenue	33,213	28,814
Operating income (loss)	5,641	4,104
Depreciation and amortization	(839)	(758)
Environmental
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	68,194	55,522
Net service revenue	47,656	38,361
Operating income (loss)	10,158	9,347
Depreciation and amortization	(712)	(680)
Infrastructure
Segment Reporting Information [Line Items]
Sales Revenue, Services, Other	17,831	16,388
Net service revenue	13,133	12,578
Operating income (loss)	2,259	2,807
Depreciation and amortization	$ (113)	$ (104)