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Other Retirement Plans (Tables) | 12 Months Ended
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Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Multiemployer Plans [Table Text Block] | these plans is outlined in the table below:
(Thousands of Dollars) | Zone Status September 30 | Funding Improvement Plan/Rehabilitation Plan Status | Contributions |  |  |
Pension Plan | 2018 | 2017 | Status | 2018 |  | 2017 |  | 2016 |  | Surcharge Imposed | Expiration Dates of CBAs
GCIU- Employer Retirement Fund 91-6024903/001 | Red | Red | Implemented | 107 |  | 123 |  | 138 |  | No | 3/20/2020
CWA/ITU Negotiated Pension Plan 13-6212879/001 | Red | Red | Implemented | 96 |  | 101 |  | 108 |  | No | 5/12/2019
|  |  |  |  |  |  | 12/31/2018
|  |  |  |  |  |  | 4/1/2019
District No. 9, International Association of Machinists and Aerospace Workers Pension Trust 43-0736847/001 | Green | Green | N/A | 29 |  | 31 |  | 31 |  | N/A | 8/01/2019

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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