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Financial Instruments and Fair Value Measurement - Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
(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

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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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
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

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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.

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