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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - Level 2 [Member] - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
ASSETS    
Investments in short-term time deposits, Estimated Fair Value $ 11,568 $ 11,587
Liabilities:    
Long-term debt, Estimated Fair Value 793,605 812,866
Investments in short-term time deposits, Carrying Cost 11,560 11,580
Long-term debt, Carrying Cost 732,028 736,706
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 10,728 11,413
Liabilities:    
Notes receivable, Carrying Cost 9,851 10,193
Note Receivable from Sale of the Renewable Power Systems Business and Other Related Businesses [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 6,165 6,288
Liabilities:    
Notes receivable, Carrying Cost $ 6,059 $ 6,061