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.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Operating Segments - Segment Summary (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016 USD ($)	Mar. 25, 2016 USD ($)	Dec. 25, 2015 USD ($)	Sep. 25, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 27, 2015 USD ($)	Dec. 26, 2014 USD ($)	Sep. 26, 2014 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($) segments	Jun. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in segments) \| segments										4
Gross revenue	$ 169,532	$ 158,130	$ 157,743	$ 135,459	$ 149,087	$ 130,777	$ 143,228	$ 123,025	$ 620,864	$ 546,117	$ 475,677
Net service revenue	132,331	121,253	111,382	100,163	114,567	100,994	99,838	92,619	465,129	408,018	354,956
Segment profit	$ 10,261	$ (23,302)	$ 6,698	$ 7,673	$ 10,703	$ 7,149	$ 6,866	$ 5,992	1,330	30,710	20,921
Acquisition and integration expense									6,571	0	0
Depreciation											4,513
Total [Member]
Segment Reporting Information [Line Items]
Gross revenue									616,292	541,932	469,846
Net service revenue									462,359	404,592	350,276
Segment profit									79,907	85,388	70,546
Acquisition and integration expense									3,444	0	0
Depreciation									6,078	4,651
Amortization									7,163	2,605	1,869
Energy
Segment Reporting Information [Line Items]
Gross revenue									182,586	168,564	160,651
Net service revenue									150,636	145,690	132,795
Segment profit									33,666	32,124	26,468
Depreciation									1,916	1,938	1,844
Amortization									1,116	1,204	1,409
Environmental
Segment Reporting Information [Line Items]
Gross revenue									289,564	303,126	245,944
Net service revenue									206,126	209,792	170,506
Segment profit									41,669	44,071	35,324
Depreciation									2,463	2,296	2,243
Amortization									1,224	1,401	460
Infrastructure
Segment Reporting Information [Line Items]
Gross revenue									83,430	70,242	63,251
Net service revenue									57,218	49,110	46,975
Segment profit									12,048	9,193	8,754
Depreciation									470	417	426
Amortization									0	$ 0	$ 0
Pipeline Services Operating Segment
Segment Reporting Information [Line Items]
Gross revenue									60,712
Net service revenue									48,379
Segment profit									(7,476)
Acquisition and integration expense									3,444
Depreciation									1,229
Amortization									$ 4,823