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Employee Benefit Plans - Schedule of Multi-Employer Pension Plans (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Local 807 Pension Plan |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Other Commitment | $ 182,000 |  | $ 182,000 |  |
Multiemployer Plans, Pension |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 452,000 | $ 283,000 | 880,000 | $ 778,000 |
Multiemployer Plans, Pension | WCT Pension Trust |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Other Commitment | 344,000 |  | 344,000 |  | $ 1,487,000
Multiemployer Plans, Pension | Local 807 Pension Plan |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Multiemployer plan, quarterly installments for withdrawal liability |  |  | 91,000 |  |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  |  | 3,000,000 |  |
Other Commitment, Due after Fifth Year | 200,000 |  | 200,000 |  |
Multiemployer Plans, Pension | WCTPP |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Assessment | 3,400,000 |  | 3,400,000 |  |
Multiemployer Plans, Pension | Employee-related | WCTPP |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Multiemployer plan, quarterly installments for withdrawal liability |  |  | 190,507 |  |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  |  | 153,822 |  |
Other Postretirement Benefit Plan |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Defined Benefit Plan, Service Cost | 147,000 | 133,000 | 294,000 | 266,000 |
Defined Benefit Plan, Interest Cost | 214,000 | 222,000 | 428,000 | 444,000 |
Defined Benefit Plan, Amortization of Gain (Loss) | (125,000) | (209,000) | (250,000) | (418,000) |
Amortization of prior service credit | (392,000) | (439,000) | (784,000) | (878,000) |
Net periodic benefit cost | $ (156,000) | $ (293,000) | $ (312,000) | $ (586,000) |
Postretirement Health Coverage |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Discount rate |  |  | 3.62% | 4.25% |
Postretirement Life Insurance |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Discount rate |  |  | 3.64% | 4.25% |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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