Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 47,770	$ 23,879
Foreign tax credits	5,994	0
Capitalized research and development expense	51,237	59,562
Pension benefits	30,870	35,676
Deferred maintenance revenue	63,976	58,791
Stock-based compensation	18,045	17,137
Accrual for litigation	0	16,310
Other reserves not currently deductible	19,343	12,058
Amortization of intangible assets	5,772	10,658
Other tax credits	31,263	23,899
Depreciation	3,077	5,582
Other	4,396	5,984
Gross deferred tax assets	281,743	269,536
Valuation allowance	(156,547)	(170,404)	(38,600)	(40,500)
Total deferred tax assets	125,196	99,132
Acquired intangible assets not deductible	(88,134)	(53,030)
Pension prepayments	(15,607)	(12,475)
Deferred revenue	(12,592)	(21,693)
Other	(4,463)	(651)
Total deferred tax liabilities	120,796	87,849
Net deferred tax assets	$ 4,400	$ 11,283