Goodwill and Other Intangible Assets - Goodwill (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				0 Months Ended
	Sep. 27, 2013	Sep. 27, 2013 Energy Operating Segment	Sep. 27, 2013 Environmental Operating Segment	Sep. 27, 2013 Infrastructure Operating Segment	Jul. 22, 2013 Utility Support Systems Inc. [Member]
Goodwill [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price					$ 5,027
Business Acquisition, Cost of Acquired Entity, Cash Paid					2,500
Business Acquisition, Cost Of Acquired Entity, Cash Paid in Year Two					1,803
Goodwill [Roll Forward]
Goodwill, Gross	68,392	24,954	36,214	7,224
Goodwill, Impaired, Accumulated Impairment Loss	(39,595)	(14,506)	(17,865)	(7,224)
Goodwill	28,797	10,448	18,349	0
Goodwill, Period Increase (Decrease)	2,180	2,180	0	0
Goodwill, Gross	70,572	27,134	36,214	7,224
Goodwill, Impaired, Accumulated Impairment Loss	(39,595)	(14,506)	(17,865)	(7,224)
Goodwill	30,977	12,628	18,349	0
Business Acquisition, Purchase Price Allocation, Goodwill Amount					2,180
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill					2,056
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares					34,066
Business Acquisition, Cost of Acquired Entity, Equity Interests Issued and Issuable					295
Additions for fiscal year 2014 acquisitions	$ 504				$ 504