Acquisitions (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended					12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012	Jan. 02, 2014 EMCOR Energy Services, Inc. [Member]	Jul. 22, 2013 Utility Support Systems Inc.	Jan. 18, 2013 GE Air Emissions Testing [Member]	Dec. 31, 2012 Heschong Mahone Group, Inc. [Member]	Sep. 03, 2011 The Payne Firm, Inc. [Member]	Jun. 30, 2014 Contract Backlog	Jun. 30, 2014 Customer Relationships
Business Acquisition [Line Items]
Additions for 2013 acquisitions	$ 504	$ 675	$ 1,080		$ 504		$ 475	$ 855
Business Combination, Net Working Capital Adjustment				244			306	157
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				861	2,056	1,849	2,618	803
Shares exchanged in business acquisitions					34,066		88,000	61,387
Business Acquisition, Purchase Price Allocation [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years								8 months	7 years
Cash				1,400	2,500		3,500	3,500
Note payable							1,500
Common stock					295		515	266
Second cash payment due one year after closing date					1,803
Stated interest rate							3.00%
Other Payments to Acquire Businesses	1,124	154	883
Purchase price of businesss				1,644	5,027	3,150		4,778
Goodwill	$ 31,679	$ 28,797	$ 24,888	$ 247	$ 2,180	$ 848	$ 2,711	$ 3,889