Summary Of Significant Accounting Policies (Narrative) (Details)	3 Months Ended				12 Months Ended
	Jul. 02, 2016	Jan. 02, 2016 customers	Jan. 03, 2015 customers	Dec. 28, 2013 customers	Sep. 30, 2016 USD ($) primary_source customers mo	Sep. 30, 2015 USD ($) customers	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Cost Method Investments					$ 11,600,000	$ 11,000,000
Deferred tax assets					$ 0	$ 36,803,000
Maximum payment terms on software purchases for credit-worthy customers (in months) | mo					24
Subscription revenue, number of primary sources | primary_source					2
Trade Accounts Receivable Major Number of Customers | customers					0	0
Revenue Major Number of Customers | customers		0	0	0
Ceiling percentage of revenue for major customer					10.00%
Contingent consideration					$ 19,570,000	$ 13,000,000	$ 15,191,000
Allowance for doubtful accounts receivable					1,000,000	1,000,000	1,600,000	$ 3,000,000
Accounts receivable written-off, net of recoveries					300,000	800,000	600,000
Bad debt expense including general and administrative expense					300,000	200,000	(800,000)
Financing receivables					7,135,000	27,434,000
Financing receivables past due					100,000	500,000
Sale of finance receivable					0	3,000,000	24,500,000
Advertising expense					2,100,000	1,100,000	2,200,000
Development costs for software					0	0	0
Capitalized software in connection with acquisition					69,900,000	13,600,000
Cumulative translation adjustment gains (loss)					(71,200,000)	(71,600,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax					(38,667,000)	(28,339,000)
Pension benefits net of tax					(27,400,000)	(20,100,000)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Before Tax					1,400,000
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax					1,200,000	0
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax					(100,000)	0
Uncollectible financing receivables written-off					0	0	$ 0
Deferred tax liabilities					0	1,622,000
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Financing receivables, current					7,100,000	21,800,000
Other Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Billed but uncollected support and subscription receivable					126,300,000	129,300,000
Long-term accounts receivable from customers for contracts with extended payment terms					0	5,600,000
Standard & Poor's, BBB-1 Rating and Above-Tier 1 [Member]
Summary Of Significant Accounting Policies [Line Items]
Financing receivables					5,953,000	16,841,000
Internally Assigned Grade, Tier 2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Financing receivables					1,182,000	10,593,000
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
Current portion [Member]
Summary Of Significant Accounting Policies [Line Items]
Contingent consideration					11,800,000
Non-current portion [Member] [Member]
Summary Of Significant Accounting Policies [Line Items]
Contingent consideration					$ 7,800,000
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative, Remaining Maturity	13 months