Summary Of Significant Accounting Policies (Narrative) (Details)	12 Months Ended								12 Months Ended					3 Months Ended
	Sep. 30, 2012 USD ($) customers M	Sep. 30, 2011 USD ($) customers	Sep. 30, 2010 USD ($)	Sep. 30, 2009 USD ($)	Sep. 30, 2012 Accounts Receivable [Member] USD ($)	Sep. 30, 2011 Accounts Receivable [Member] USD ($)	Sep. 30, 2012 Other Assets [Member] USD ($)	Sep. 30, 2011 Other Assets [Member] USD ($)	Sep. 30, 2012 Purchased Software [Member] Y	Sep. 30, 2012 Customer Lists [Member] Y	Sep. 30, 2012 Trademarks [Member] Y	Sep. 30, 2012 Computer Hardware And Software [Member] Y	Sep. 30, 2012 Furniture And Fixtures [Member] Y	Jul. 02, 2011 MKS Inc [Member] USD ($)	Jun. 30, 2011 MKS Inc [Member] USD ($)	Jun. 30, 2011 MKS Inc [Member] CAD	Sep. 30, 2012 S&P bond rating BBB-1 and above-Tier 1 [Member] USD ($)	Sep. 30, 2011 S&P bond rating BBB-1 and above-Tier 1 [Member] USD ($)	Sep. 30, 2012 Internal Credit Assessment-Tier 2 [Member] USD ($)	Sep. 30, 2011 Internal Credit Assessment-Tier 2 [Member] USD ($)	Sep. 30, 2012 Internal Credit Assessment-Tier 3 [Member] USD ($)	Sep. 30, 2011 Internal Credit Assessment-Tier 3 [Member] USD ($)	Sep. 30, 2012 Other Current Assets [Member] USD ($)	Sep. 30, 2011 Other Current Assets [Member] USD ($)	Sep. 30, 2010 Accrued Expenses and Other Current Liabilities [Member] USD ($)
Summary Of Significant Accounting Policies [Line Items]
Maximum payment terms on software purchases for credit-worthy customers (in months)	24
Billed but uncollected maintenance receivable							$ 110,700,000	$ 93,000,000
Major number of customers	0	0
Ceiling percentage of revenue for major customer	10.00%
Allowance for doubtful accounts receivable	3,400,000	3,900,000	4,600,000	5,300,000
Accounts receivable written-off, net of recoveries	800,000	800,000	1,900,000
Bad debt expense including general and administrative expense	258,000	51,000	1,243,000
Financing receivables	42,463,000	57,941,000															34,017,000	38,575,000	8,446,000	17,568,000	0	1,798,000
Financing receivables, current					29,500,000	41,900,000
Long-term accounts receivable from customers for contracts with extended payment terms							13,000,000	16,000,000
Financing receivables past due	0	0
Reserve for credit losses	0	0	0
Sale of finance receivable	14,300,000	4,100,000	31,600,000
Uncollectible financing receivables written-off	0	0	0
Fair value of our forward contracts																							200,000	5,500,000
Fair value of our forward contracts liability																									2,000,000
Net losses on foreign currency exposures	5,900,000	12,300,000	2,900,000											4,400,000
Net realized and unrealized (gain) loss on forward contracts (excluding the underlying foreign currency exposure being hedged)	3,600,000	4,100,000	1,800,000
Foreign currency forward contract															305,000,000	292,000,000
Development costs for software	0	0	0
Capitalized software		44,900,000	400,000
Amortization period, minimum (in years)									3	4	3	3	3
Amortization period, maximum (in years)									10	12	7	5	8
Advertising expense	2,800,000	2,600,000	2,400,000
Correction to deferred tax benefits on unrecognized actuarial losses related to pension benefits	2,000,000
Cumulative translation adjustment gains (loss)	(7,600,000)	5,400,000
Pension benefits net of tax	$ (64,900,000)	$ (59,400,000)