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Financial Instruments and Fair Value Measurement - Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Quoted Prices in Active Markets for Identical Assets (Level 1)
Non-qualified Supplemental Savings Plan
Assets held in Non-qualified Supplement Savings Plan, at fair value	$ 13,400	$ 13,400
Equity securities
Available-for-sale securities
Cost	38,473	38,473
Gross Unrealized Gains	53,294	33,051
Estimated Fair Value	$ 91,767	$ 71,524

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

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-Publisher FASB
-Name Accounting Standards Codification
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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.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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