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Financial Instruments and Fair Value Measurement - Equity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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(Level 1) |  |
Non-qualified Supplemental Savings Plan |  |
Assets held in Non-qualified Supplement Savings Plan, at fair value | $ 14,600 | $ 13,900
Equity securities |  |
Available-for-sale securities |  |
Cost | 38,473 | 38,473
Gross Unrealized Gains | 30,856 | 31,700
Estimated Fair Value | $ 69,329 | $ 70,173

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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