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Employee Benefit Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Multiemployer Pension Plans |  |  |
Total contributions made | $ 54,724 | $ 48,709 | $ 46,011
Contributions to other multiemployer plans | $ 19,827 | $ 20,378 | 16,606
Boilermaker-Blacksmith National Pension Trust [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, Description | Described below (1) |  |
Multiemployer Pension Plans |  |  |
EIN/Pension Plan Number | 48-6168020/001 |  |
Multiemployer Plans, Certified Zone Status, Description | Yellow | Described below (2) |
FIP/RP Status Pending or Implemented | Implemented |  |
Total contributions made | $ 8,525 | $ 7,098 | 7,658
Multiemployer Plan, Surcharge | No |  |
Joint Pension Fund Local Union One Six Four Ibew [Member] |  |  |
Multiemployer Pension Plans |  |  |
EIN/Pension Plan Number | 22-6031199/001 |  |
Multiemployer Plans, Certified Zone Status, Description | Yellow | Described below (2) |
FIP/RP Status Pending or Implemented | Implemented |  |
Total contributions made | $ 2,391 | $ 2,709 | 2,635
Multiemployer Plan, Surcharge | No |  |
Expiration Date of Collective-Bargaining Agreement | May 31, 2021 |  |
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 | NA |  |
Total contributions made | $ 2,489 | $ 2,392 | 3,063
Surcharge Imposed | No |  |
Expiration Date of Collective-Bargaining Agreement | May 31, 2019 |  |
IBEW Local Four Five Six Pension Plan [Member] [Domain] |  |  |
Multiemployer Pension Plans |  |  |
EIN/Pension Plan Number | 22-6238995/001 |  |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending or Implemented | NA |  |
Total contributions made | $ 6,005 | $ 2,777 | 1,168
Surcharge Imposed | No |  |
Expiration Date of Collective-Bargaining Agreement | May 31, 2021 |  |
Local 351 IBEW Pension Plan [Member] |  |  |
Multiemployer Pension Plans |  |  |
EIN/Pension Plan Number | 22-3417366/001 |  |
Multiemployer Plans, Certified Zone Status, Description | Green | Green |
FIP/RP Status Pending or Implemented | Implemented |  |
Total contributions made | $ 1,187 | $ 2,796 | 5,018
Multiemployer Plan, Surcharge | No |  |
Expiration Date of Collective-Bargaining Agreement | Dec. 04, 2021 |  |
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 | $ 1,558 | $ 2,234 | 1,265
Surcharge Imposed | Yes |  |
Expiration Date of Collective-Bargaining Agreement | Apr. 30, 2020 |  |
IBEW Local Union Nine Eight Pension Plan [Member] |  |  |
Multiemployer Pension Plans |  |  |
EIN/Pension Plan Number | 23-1990722/001 |  |
Multiemployer Plans, Certified Zone Status, Description | Red | Described below (2) |
FIP/RP Status Pending or Implemented | Implemented |  |
Total contributions made | $ 1,106 | $ 1,519 | 1,653
Multiemployer Plan, Surcharge | Yes |  |
Expiration Date of Collective-Bargaining Agreement | May 29, 2020 |  |
Indiana Laborers Pension Fund [Domain] |  |  |
Multiemployer Pension Plans |  |  |
EIN/Pension Plan Number | 35-6027150/001 |  |
Multiemployer Plans, Certified Zone Status, Description | Described below (2) | Described below (2) |
FIP/RP Status Pending or Implemented | Implemented |  |
Total contributions made | $ 3,542 | $ 2,458 | 2,320
Multiemployer Plan, Surcharge | Described below (2) |  |
Expiration Date of Collective-Bargaining Agreement | May 31, 2019 |  |
Ironworkers Mid-America Pension Plan [Member] |  |  |
Multiemployer Pension Plans |  |  |
EIN/Pension Plan Number | 36-6488227/001 |  |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending or Implemented | NA |  |
Total contributions made | $ 4,412 | $ 1,785 | 2,248
Surcharge Imposed | No |  |
Expiration Date of Collective-Bargaining Agreement | May 31, 2019 |  |
Plumbers and Pipefitters Local Union Seven Four Pension Fund [Member] |  |  |
Multiemployer Pension Plans |  |  |
FIP/RP Status Pending or Implemented | Implemented |  |
Pipefitters Retirement Fund Local Five Nine Seven [Member] |  |  |
Multiemployer Pension Plans |  |  |
EIN/Pension Plan Number | 62-6105084/001 |  |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending or Implemented | NA |  |
Total contributions made | $ 3,682 | $ 2,563 | $ 2,377
Surcharge Imposed | No |  |
Expiration Date of Collective-Bargaining Agreement | May 31, 2019 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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