Summary Of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Sep. 30, 2015 USD ($) primary_source customers mo	Sep. 30, 2014 USD ($) customers	Sep. 30, 2013 USD ($) customers	Sep. 30, 2012 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Maximum payment terms on software purchases for credit-worthy customers (in months) | mo	24
License and subscription revenue, number of primary sources | primary_source	3
Major number of customers | customers	0	0	0
Ceiling percentage of revenue for major customer	10.00%
Allowance for doubtful accounts receivable	$ 1,000,000	$ 1,600,000	$ 3,000,000	$ 3,400,000
Accounts receivable written-off, net of recoveries	800,000	600,000	600,000
Bad debt expense including general and administrative expense	157,000	(833,000)	213,000
Financing receivables	27,434,000	58,141,000
Financing receivables past due	528,000	0	0
Sale of finance receivable	3,000,000	24,500,000	17,000,000
Uncollectible financing receivables written-off	0	0	0
Net losses on foreign currency exposures	2,700,000	4,500,000	2,000,000
Net realized and unrealized gain (loss) on forward contracts (excluding the underlying foreign currency exposure being hedged)	600,000	(3,800,000)	3,400,000
Development costs for software	0	0	0
Capitalized software in connection with acquisition	13,600,000	48,900,000
Advertising expense	1,100,000	2,200,000	4,200,000
Cumulative translation adjustment gains (loss)	(71,600,000)	(24,500,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(28,339,000)	(95,925,000)	(74,357,000)
Pension benefits net of tax	(20,100,000)	(69,900,000)
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Financing receivables, current	21,800,000	44,600,000
Other Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Billed but uncollected support and subscription receivable	129,300,000	116,200,000
Long-term accounts receivable from customers for contracts with extended payment terms	5,600,000	13,500,000
Other Current Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
fair value outstanding forward contract	500,000	300,000
Other Current Liabilities [Member]
Summary Of Significant Accounting Policies [Line Items]
fair value outstanding forward contract	46,000	900,000
Standard & Poor's, BBB-1 Rating and Above-Tier 1 [Member]
Summary Of Significant Accounting Policies [Line Items]
Financing receivables	16,841,000	41,152,000
Internally Assigned Grade, Tier 2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Financing receivables	10,593,000	16,989,000
Internally Assigned Grade, Tier 3 [Member]
Summary Of Significant Accounting Policies [Line Items]
Financing receivables	$ 0	0
Minimum [Member] | Computer Hardware And Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)	3 years
Minimum [Member] | Furniture And Fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)	3 years
Maximum [Member] | Purchased Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)	11 years
Maximum [Member] | Customer Lists [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)	12 years
Maximum [Member] | Trademarks And Trade Names [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)	12 years
Maximum [Member] | Computer Hardware And Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)	5 years
Maximum [Member] | Furniture And Fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)	8 years
Foreign Exchange Forward [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative maturity (in months)	3 months
Unallocated Financing Receivables [Member]
Summary Of Significant Accounting Policies [Line Items]
Reserve for credit losses	$ 0	$ 0	$ 0