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Employee Benefit Plans - Multi-Employer Plan (Details) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) plan | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2015 quarter | Jan. 05, 2015 USD ($) | Nov. 18, 2014 USD ($) | Jun. 30, 2012 USD ($)
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Defined contribution plan, employer matching contribution | $ 2,000,000 | $ 1,600,000 | $ 1,600,000 |  |  |  |  |
Multiemployer plan, unfunded benefit liability |  |  |  | $ 3,300,000 |  |  |  |
Withdrawal obligation | 3,800,000 |  |  |  |  |  |  |
Multiemployer plan, period contribution | 4,800,000 | $ 5,300,000 | $ 6,300,000 |  |  |  |  |
Multiemployer plan, estimated contribution in next fiscal year | $ 5,100,000 |  |  |  |  |  |  |
Western Conference of Teamsters Pension Plan |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Funded status of multiemployer plans | 92.00% | 91.20% | 91.70% |  |  |  |  |
Employer contributions | $ 1,605,000 | $ 2,114,000 | $ 2,587,000 |  |  |  |  |
Employer contributions (percentage) |  | 5.00% |  |  |  |  |  |
Labor Management Pension Fund |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Withdrawal obligation | 3,800,000 |  |  |  |  | $ 4,900,000 | $ 4,400,000 | $ 4,300,000
Multiemployer plan, quarterly installments for withdrawal liability | 91,000 |  | 100,000 |  |  |  |  |
Multiemployer plan, quarterly installments for withdrawal liability, number of quarters | quarter |  |  |  |  | 80 |  |  |
Program for Enhanced Early Retirement |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Employer contributions (percentage) |  | 6.50% |  |  |  |  |  |
Employer contributions (hours) |  | 173 |  |  |  |  |  |
All Other Plans |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Employer contributions | 35,000 | $ 39,000 | $ 39,000 |  |  |  |  |
Multiemployer Plans, Pension |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Multiemployer plan, estimated contribution in next fiscal year | $ 1,700,000 |  |  |  |  |  |  |
Other Postretirement Benefits Plan |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Multiemployer plans, number of plans | plan | 9 |  |  |  |  |  |  |
Employer contributions | $ 771,000 | $ 399,000 |  |  |  |  |  |
Multiemployer Plans, Defined Benefit Pension Plans [Member] |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Multiemployer plans, number of plans | plan | 2 |  |  |  |  |  |  |

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- Definition Multiemployer Plan, Number of Plans + References No definition available. + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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