Summary Of Significant Accounting Policies (Narrative) (Details) Share data in Millions, unless otherwise specified	12 Months Ended				3 Months Ended				12 Months Ended
	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2009 USD ($)	Sep. 30, 2008 USD ($)	Jul. 02, 2011 MKS Inc [Member] USD ($)	Sep. 30, 2011 MKS Inc [Member] USD ($)	Jun. 30, 2011 MKS Inc [Member] USD ($)	Jun. 30, 2011 MKS Inc [Member] CAD	Sep. 30, 2011 Purchased Software [Member]	Sep. 30, 2011 Customer Lists [Member]	Sep. 30, 2011 Trademarks [Member]	Sep. 30, 2011 Computer Hardware And Software [Member]	Sep. 30, 2011 Furniture And Fixtures [Member]	Sep. 30, 2011 Accounts Receivable [Member] USD ($)	Sep. 30, 2010 Accounts Receivable [Member] USD ($)	Sep. 30, 2011 Other Assets [Member] USD ($)	Sep. 30, 2010 Other Assets [Member] USD ($)
Summary Of Significant Accounting Policies [Line Items]
Billed but uncollected maintenance receivable																$ 93,000,000	$ 76,800,000
Major number of customer	0
Ceiling percentage of revenue for major customer	10.00%
Allowance for doubtful accounts receivable	3,900,000	4,600,000	5,300,000	5,200,000
Accounts receivable written-off, net of recoveries	800,000	1,900,000	1,500,000
Bad debt expense including general and administrative expense	51,000	1,243,000	1,604,000
Maximum payment terms on software purchases for credit-worthy customers (in months)	24
Amounts due from customers for contracts with extended payment terms	72,300,000	44,300,000
Current accounts receivable from customers for contracts with extended payment terms														55,200,000	27,200,000
Long-term accounts receivable from customers for contracts with extended payment terms																17,100,000	17,100,000
Sale of finance receivable	4,100,000	31,600,000	16,700,000
Reserve for credit losses	0	0	0
Uncollectible financing receivables written-off	0	0	0
Fair value of our forward contracts asset	5,500,000
Fair value of our forward contracts liability		2,000,000
Net losses on foreign currency exposures	12,300,000	2,900,000	3,600,000		4,400,000
Net realized and unrealized (gain) loss on forward contracts (excluding the underlying foreign currency exposure being hedged)	4,100,000	1,800,000	3,000,000
Foreign currency forward contract							305,000,000	292,000,000
Development costs for software	0	0	0
Capitalized software	44,900,000	400,000	6,000,000			117,900,000
Advertising expense	2,600,000	2,400,000	2,000,000
Cumulative translation adjustment gains (loss)	(5,400,000)	1,800,000
Pension benefits net of tax	$ (59,400,000)	$ (54,300,000)
Stock option excluded from computation of EPS	0.2	1.7	3.8
Amortization period, maximum (in years)									10	12	7	5	8
Amortization period, minimum (in years)									3	5	3	3	3