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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable from municipalities, Carrying Cost $ 13,262 $ 13,462
Investments in short-term time deposits, Carrying Cost 70 8,874
Long-term debt, Carrying Cost (1,003,142) (1,095,292)
Fair Value Hierarchy Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable from municipalities, Estimated Fair Value 13,752 13,458
Investments in short-term time deposits, Estimated Fair Value 70 8,883
Long-term debt, Estimated Fair Value $ (1,021,992) $ (1,094,987)