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Goodwill and other Intangible Assets Schedule of Intangible Assets (Details) - USD ($) | 3 Months Ended |
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Mar. 31, 2019 | Sep. 30, 2018
Schedule of Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 3,650,000 |
Mastheads | 21,883,000 | $ 21,883,000
Other intangible assets, net | 115,005,000 | 119,819,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 16,192,000 |
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two | 15,929,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 13,289,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 12,384,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 11,704,000 |
Customer Lists [Member] |  |
Schedule of Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 696,632,000 | 692,886,000
Finite-Lived Intangible Assets, Accumulated Amortization | 603,510,000 | 594,950,000
Finite-Lived Intangible Assets, Net | $ 93,122,000 | $ 97,936,000

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- Definition Schedule of Intangible Assets [Line Items]- Tabular disclosure of assets excluding financial assets and goodwill, lacking physical substance with both finite and infinite lives, by major class. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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