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Employee Benefit Plans (Details) (USD $) | 12 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011
Multiemployer Pension Plans |  |  |  |  |  |
Total contributions made | $ 24,465 |  | $ 16,537 |  | $ 20,803 |
Contributions to other multiemployer plans | 8,966 |  | 7,616 |  | 8,765 |
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 | 3,943 |  | 1,538 | [1] | 3,054 | [1]
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective-Bargaining Agreement | May 31, 2014 |  |  |  |  |
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 | 2,882 |  | 2,845 |  | 3,783 |
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 | 2,387 |  | 1,608 |  | 951 |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective-Bargaining Agreement | May 31, 2014 |  |  |  |  |
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 | 2,384 |  | 977 |  | 440 |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective-Bargaining Agreement | Nov. 30, 2013 |  |  |  |  |
Local 351 IBEW Pension Plan [Member] |  |  |  |  |  |
Multiemployer Pension Plans |  |  |  |  |  |
EIN/Pension Plan Number | 22-3417366/001 |  |  |  |  |
Pension Protection Act Zone Status | Yellow |  | Yellow |  |  |
FIP/RP Status Pending or Implemented | Implemented |  |  |  |  |
Total contributions made | 2,281 |  | 1,140 |  | 2,932 |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective-Bargaining Agreement | Sep. 30, 2013 |  |  |  |  |
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 | $ 1,622 |  | $ 813 |  | $ 878 |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective-Bargaining Agreement | Apr. 30, 2014 |  |  |  |  |
[1] | Our contributions for the Joint Pension Fund Local Union 164 IBEW exceeded 5% of total contributions for the 2011 plan year. This information was not available for 2012.
[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.

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- Definition Contributions to other multiemployer plans. + References No definition available. + Details
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- Definition Multiemployer plans number. + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Description of the significant collective-bargaining arrangements within the range of expiration dates for collective-bargaining arrangements requiring contributions to a multiemployer plan as well as other information to help investors understand the significance of the collective-bargaining agreements and when they expire. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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