Composition Of Certain Financial Statement Captions (Schedule Of Other Non-Current Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Composition Of Certain Financial Statement Captions [Abstract]
Supplemental retirement plan obligations	$ 2,694	$ 2,540
Non-current tax liabilities	80,925	68,254
Other liabilities	12,313	12,128
Other non-current liabilities	$ 95,932	$ 82,922