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Employee Benefit Plans Narrative (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) quarter hour plan | Jun. 30, 2012 USD ($) quarter | Jun. 30, 2018 USD ($) | Jan. 05, 2015 USD ($) | Nov. 18, 2014 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
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% |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Amount | $ 500,000 |  |  |  |
Minimum |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Investment horizon for long-term capital market assumptions | 20 years |  |  |  |
Maximum |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Investment horizon for long-term capital market assumptions | 30 years |  |  |  |
WCTPP [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Assessment | $ 3,400,000 |  |  |  |
Multiemployer plan, quarterly installments for withdrawal liability, number of quarters | quarter | 18 |  |  |  |
Labor Management Pension Fund |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [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 |  |  |
Other Postretirement Benefit Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Multiemployer plans, number of plans | plan | 9 |  |  |  |
Multiemployer Plans, Pension | Multiemployer Plans, Defined Benefit Pension Plans [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Multiemployer plans, number of plans | plan | 2 |  |  |  |
Multiemployer Plans, Pension | Multiemployer Plans, Defined Contribution Pension Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Multiemployer plans, number of plans | plan | 1 |  |  |  |
Employee-related | WCTPP [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Withdrawal obligation | $ 3,200,000 |  |  |  |
Multiemployer plan, quarterly installments for withdrawal liability | $ 190,507 |  |  |  |

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