Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 71,533	$ 57,677
Foreign tax credits	15,962	9,022
Capitalized research and development expense	31,690	41,720
Pension benefits	11,009	39,063
Deferred revenue	71,399	67,433
Stock-based compensation	16,777	18,828
Other reserves not currently deductible	21,940	24,273
Amortization of intangible assets	62,227	9,302
Other tax credits	37,270	30,982
Depreciation	3,465	3,157
Capital loss carryforward	8,040	7,964
Other	10,116	7,118
Gross deferred tax assets	361,428	316,539
Valuation allowance	(198,168)	(177,541)	$ (156,500)	$ (170,400)
Total deferred tax assets	163,260	138,998
Acquired intangible assets not deductible	(124,401)	(110,003)
Pension prepayments	(395)	(20,263)
Deferred revenue	(3,110)	(1,446)
Other	(3,598)	(4,484)
Deferred Tax Liabilities, Gross	131,504	136,196
Net deferred tax assets	$ 31,756	$ 2,802