Accumulated Other Comprehensive Loss (Changes In Each Component Of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (13,741)	$ (10,148)	$ (4,408)
Other comprehensive income before reclassifications	(2,382)	(5,594)	(5,937)
Amounts reclassified from accumulated other comprehensive income	857	2,001	197
Net period other comprehensive income	(1,525)	(3,593)	(5,740)
Balance	(15,266)	(13,741)	(10,148)
Cumulative Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(5,468)	(2,493)	(383)
Other comprehensive income before reclassifications	536	(4,417)	(2,110)
Amounts reclassified from accumulated other comprehensive income	236	1,442
Net period other comprehensive income	772	(2,975)	(2,110)
Balance	(4,696)	(5,468)	(2,493)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	259	166	132
Other comprehensive income before reclassifications	112	177	161
Amounts reclassified from accumulated other comprehensive income	(371)	(84)	(127)
Net period other comprehensive income	(259)	93	34
Balance		259	166
Pension And Postretirement Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(8,532)	(7,821)	(4,157)
Other comprehensive income before reclassifications	(3,030)	(1,354)	(3,988)
Amounts reclassified from accumulated other comprehensive income	992	643	324
Net period other comprehensive income	(2,038)	(711)	(3,664)
Balance	$ (10,570)	$ (8,532)	$ (7,821)