Goodwill and Other Intangible Assets - Goodwill (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended				0 Months Ended
	Mar. 28, 2014	Mar. 28, 2014 Energy Operating Segment	Mar. 28, 2014 Environmental Operating Segment	Mar. 28, 2014 Infrastructure Operating Segment	Jan. 02, 2014 EMCOR Energy Services, Inc. [Member]	Jul. 22, 2013 Utility Support Systems Inc. [Member]
Goodwill [Line Items]
Business Acquisition, Purchase Price					$ 1,644	$ 5,027
Business Acquisition, Cash Paid					1,400	2,500
Business Acquisition, 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)	2,882	2,882	0	0
Goodwill, Gross	71,274	27,836	36,214	7,224
Goodwill, Impaired, Accumulated Impairment Loss	(39,595)	(14,506)	(17,865)	(7,224)
Goodwill	31,679	13,330	18,349	0	247	2,180
Business Acquisition, Intangible Assets Other than Goodwill					861	2,056
Business Acquisition, Equity Interest Issued or Issuable (in shares)						34,066
Business Acquisition, Equity Interests Issued and Issuable						295
Additions for fiscal year 2014 acquisitions	504					504
Business Combination, Net Working Capital Adjustment					$ 244