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Financial Instruments and Fair Value Measurement - Equity Securities (Details)
$ in Thousands
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
item
Available-for-sale securities    
Number of securities in an unrealized loss position under 30 days | item   1
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 $ 12,800 $ 12,900
Equity securities    
Available-for-sale securities    
Cost 64,462 64,462
Gross Unrealized Gains 33,257 28,530
Gross Unrealized Losses 10,669 1,509
Estimated Fair Value $ 87,050 $ 91,483