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Accounts Receivable (Schedule of Accounts Receivable) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for uncollectible customer amounts $ (3,675) $ (3,776)
Accounts receivable 365,351 402,182
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross 326,057 367,715
Accounts Receivable from Chinese Financial Institution [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross $ 42,969 $ 38,243