Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2012
Multiemployer Pension Plans
Total contributions made	$ 30,369		$ 24,465		$ 16,537
Contributions to other multiemployer plans	14,503		8,966		7,616
Joint Pension Fund Local Union One Six Four Ibew [Member]
Multiemployer Pension Plans
EIN/Pension Plan Number	22-6031199/001
Pension Protection Act Zone Status	Yellow		Yellow
Total contributions made	2,955	[1]	3,943	[1]	1,538	[1]
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	May 31, 2017
Boilermaker-Blacksmith National Pension Trust [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, Description	Described below (2)	[2]
Multiemployer Pension Plans
EIN/Pension Plan Number	48-6168020/001
Pension Protection Act Zone Status	Yellow		Yellow
FIP/RP Status Pending or Implemented	Implemented
Total contributions made	3,271		2,882		2,845
Surcharge Imposed	No
Joint Pension Fund Local Union Number One Zero Two [Member] [Domain]
Multiemployer Pension Plans
EIN/Pension Plan Number	22-1615726/001
Pension Protection Act Zone Status	Green		Green
FIP/RP Status Pending or Implemented	Implemented
Total contributions made	2,381		2,387		1,608
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	May 31, 2015
IBEW Local Four Five Six Pension Plan [Member] [Domain]
Multiemployer Pension Plans
EIN/Pension Plan Number	22-6238995/001
Pension Protection Act Zone Status	Yellow		Yellow
FIP/RP Status Pending or Implemented	Implemented
Total contributions made	940		2,384		977
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	May 31, 2017
Local 351 IBEW Pension Plan [Member]
Multiemployer Pension Plans
EIN/Pension Plan Number	22-3417366/001
Multiemployer Plans, Certified Zone Status, Description	Described below (3)	[3]
Pension Protection Act Zone Status			Yellow
FIP/RP Status Pending or Implemented	Implemented
Total contributions made	2,218		2,281		1,140
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Sep. 27, 2016
Steamfitters Local Union Number Four Two Zero Pension Plan [Member] [Domain]
Multiemployer Pension Plans
EIN/Pension Plan Number	23-2004424/001
Pension Protection Act Zone Status	Red		Red
FIP/RP Status Pending or Implemented	Implemented
Total contributions made	1,677		1,622		813
Surcharge Imposed	Yes
Expiration Date of Collective-Bargaining Agreement	Apr. 30, 2017
Indiana Laborers Pension Fund [Domain]
Multiemployer Pension Plans
EIN/Pension Plan Number	35-6027150/001
Pension Protection Act Zone Status	Yellow		Yellow
Total contributions made	1,268		0		0
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	May 31, 2017
Ironworkers Mid-America Pension Plan [Member]
Multiemployer Pension Plans
EIN/Pension Plan Number	36-6488227/001
Pension Protection Act Zone Status	Green		Green
Total contributions made	$ 1,156		$ 0		$ 0
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	May 31, 2015

[1] Our contributions for the Joint Pension Fund Local Union 164 IBEW exceeded 5% of total contributions for the 2012 plan year. This information was not available for the 2013 plan year.

[2] Our collective bargaining agreements with the Boilermaker-Blacksmith National Pension Trust are under a National Maintenance Agreement platform which is evergreen in terms of expiration. However, the agreements allow for termination of the collective bargaining agreement by either party with a predetermined written notice.

[3] For the Local 351 IBEW Pension Plan, the Company has not received a funding notification that covers the Company's fiscal year 2014 during the preparation of this Form 10-K. Under Federal pension law, if a multiemployer pension plan is determined to be in critical or endangered status, the plan must provide notice of this status to participants, beneficiaries, the bargaining parties, the Pension Benefit Guaranty Corporation, and the Department of Labor. The Company also observed that the Local 351 IBEW Pension Plan has not submitted any Critical or Endangered Status Notices to the Department of Labor for 2014 (which can be accessed at http://www.dol.gov/ebsa/criticalstatusnotices.html).