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Summary Of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 12 Months Ended |
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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 |  |  |  |  |  |  |

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