Consolidated Statements Of Comprehensive (Loss) Income (Parentheticals) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Unrealized hedge gain (loss) arising during the period, tax	$ 100,000	$ 0	$ 0
Net hedge loss reclassified into earnings, tax	100,000	0	0
Foreign currency translation adjustment, tax	0	0	0
Unrealized loss on marketable securities, tax	0	0	0
Tax provision (benefit) related to pension net gain(loss) occurring during the year	3,600,000	(3,500,000)	(1,600,000)
Tax benefit related to amortization of net actuarial loss	$ 1,000,000	$ 700,000	$ 18,500,000