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Note 4 Debt Schedule (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Debt Instrument [Line Items]    
Non-interest bearing promissory notes $ 21,652 $ 19,863
Total long-term debt 396,652 394,863
Other Notes Payable, Current 3,416 3,416
Long-term debt 393,236 391,447
Secured Notes Due 2019    
Debt Instrument [Line Items]    
Secured debt $ 375,000 $ 375,000
Debt Instrument, Maturity Date Jun. 01, 2019