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Employee Benefit Plans - Multi-Employer Plan (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) quarter hour plan | Sep. 30, 2017 USD ($) | Jun. 30, 2012 USD ($) quarter | Jun. 30, 2018 USD ($) | Jan. 05, 2015 USD ($) | Nov. 18, 2014 USD ($)
Multiemployer Plans [Line Items] |  |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Amount | $ 500,000 |  |  |  |  |
Multiemployer plans, number of plans | plan | 2 |  |  |  |  |
Defined contribution plan, hours threshold for eligibility | hour | 1,000 |  |  |  |  |
Defined contribution plan, employer matching contribution percent | 50.00% |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of eligible income | 6.00% |  |  |  |  |
Defined contribution plan, employer matching contribution, annual vesting percent | 20.00% |  |  |  |  |
Defined contribution plan, vesting period | 5 years |  |  |  |  |
Defined contribution plan, automatic vesting age | 65 years |  |  |  |  |
Defined contribution plan, employee vesting percent | 100.00% |  |  |  |  |
WCTPP [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Multiemployer plan, quarterly installments for withdrawal liability, number of quarters | quarter | 18 |  |  |  |  |
Labor Management Pension Fund |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Withdrawal obligation | $ 3,000,000 |  | $ 4,300,000 | $ 3,800,000 | $ 4,900,000 | $ 4,400,000
Multiemployer plan, quarterly installments for withdrawal liability |  |  | $ 100,000 |  |  |
Multiemployer plan, quarterly installments for withdrawal liability, number of quarters | quarter |  |  | 80 |  |  |
Multiemployer Plans, Pension | Multiemployer Plans, Defined Benefit Pension Plans [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Multiemployer plans, number of plans | plan | 2 |  |  |  |  |
Other Postretirement Benefit Plan |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Service Cost | $ 133,000 | $ 152,000 |  |  |  |
Multiemployer plans, number of plans | plan | 9 |  |  |  |  |
Defined Benefit Plan, Interest Cost | $ 222,000 | 209,000 |  |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) | (209,000) | (210,000) |  |  |  |
Amortization of prior service credit | (439,000) | (439,000) |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (293,000) | $ (288,000) |  |  |  |
Employee-related | WCTPP [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Withdrawal obligation | 3,200,000 |  |  |  |  |
Multiemployer plan, quarterly installments for withdrawal liability | $ 190,507 |  |  |  |  |

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- Definition Defined Contribution Plan, Employee Contribution Percentage Vested, Percent + References No definition available. + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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 (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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