Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Financial liability on recurring basis	$ 0	$ 0
Investments in Short-Term Time Deposits [Member]
Interest rate used to estimate fair value	6.90%
Long Term Notes Receivable From Municipalities [Member]
Interest rate used to estimate fair value	2.20%	3.00%
Borrowings [Member]
Interest rate used to estimate fair value	1.90%	2.80%