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Financial Instruments and Fair Value Measurements (Financial Assets that are Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets $ 91,206 $ 103,324
Total financial liabilities 23,000
Cross Currency Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 5,172  
Hedging liabilities, cross currency interest rate swaps 23,000
Fair Value Hierarchy Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets 86,034 103,324
Total financial liabilities
Fair Value Hierarchy Level 1 [Member] | Cross Currency Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Hedging liabilities, cross currency interest rate swaps
Fair Value Hierarchy Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets 5,172
Total financial liabilities 23,000
Fair Value Hierarchy Level 2 [Member] | Cross Currency Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 5,172  
Hedging liabilities, cross currency interest rate swaps 23,000
Fair Value Hierarchy Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets
Total financial liabilities
Fair Value Hierarchy Level 3 [Member] | Cross Currency Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Hedging liabilities, cross currency interest rate swaps
Cash [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 49,568 59,838
Cash [Member] | Fair Value Hierarchy Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 49,568 59,838
Cash [Member] | Fair Value Hierarchy Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents
Cash [Member] | Fair Value Hierarchy Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents
Investments in Reverse Repurchase Agreements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 337 4,582
Investments in Reverse Repurchase Agreements [Member] | Fair Value Hierarchy Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 337 4,582
Investments in Reverse Repurchase Agreements [Member] | Fair Value Hierarchy Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents
Investments in Reverse Repurchase Agreements [Member] | Fair Value Hierarchy Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents
Investments in Term Deposits with Foreign Banks [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 15,398 19,174
Investments in Term Deposits with Foreign Banks [Member] | Fair Value Hierarchy Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 15,398 19,174
Investments in Term Deposits with Foreign Banks [Member] | Fair Value Hierarchy Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents
Investments in Term Deposits with Foreign Banks [Member] | Fair Value Hierarchy Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents
Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 20,731 19,730
Equity Securities [Member] | Fair Value Hierarchy Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 20,731 19,730
Equity Securities [Member] | Fair Value Hierarchy Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities
Equity Securities [Member] | Fair Value Hierarchy Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities