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Summary Of Significant Accounting Policies (Narrative) (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) primary_source mo | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jan. 12, 2016 USD ($) | May 07, 2015 USD ($) | Sep. 30, 2014 USD ($) | Mar. 29, 2014 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Maximum payment terms on software purchases for credit-worthy customers (in months) | mo |  | 24 |  |  |  |  |  |
Subscription revenue, number of primary sources | primary_source |  | 2 |  |  |  |  |  |
Cloud services revenue percent of total revenue |  | 5.00% | 5.00% | 5.00% |  |  |  |
Cost Method Investments |  | $ 700,000 | $ 11,600,000 |  |  |  |  |
Proceeds from sale of cost method investments |  | 13,700,000 |  |  |  |  |  |
Gain on sale of cost-method investments |  | 3,700,000 |  |  |  |  |  |
Payment of contingent consideration |  | 12,100,000 | 11,500,000 |  |  |  |  |
Contingent consideration |  | 8,400,000 | 19,570,000 | $ 13,000,000 |  |  |  |
Allowance for doubtful accounts receivable |  | 1,100,000 | 1,000,000 | 1,000,000 |  |  | $ 1,600,000 |
Accounts receivable written-off, net of recoveries |  | 1,500,000 | 300,000 | 800,000 |  |  |  |
Bad debt expense including general and administrative expense |  | 1,500,000 | 300,000 | 200,000 |  |  |  |
Development costs for software |  | 0 | 0 | 0 |  |  |  |
Capitalized software in connection with acquisition |  | 6,000,000 | 71,500,000 |  |  |  |  |
Advertising expense |  | 2,500,000 | 2,100,000 | 1,100,000 |  |  |  |
Cumulative translation adjustment gains (loss) |  | (54,600,000) | (71,200,000) |  |  |  |  |
Pension benefits, before tax |  | 24,700,000 | 38,700,000 |  |  |  |  |
Pension benefits net of tax |  | 17,600,000 | 27,400,000 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Before Tax |  | 1,800,000 |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax |  | 1,500,000 | 1,400,000 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | (100,000) | (100,000) |  |  |  |  |
Unamortized Debt Issuance Expense |  | 5,719,000 | 6,524,000 |  |  |  |  |
Deferred Tax Assets, Other |  | $ 15,849,000 | 14,778,000 |  |  |  |  |
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 |  |  |  |  |  |
Kepware [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Payment of contingent consideration |  | $ 9,600,000 | 0 |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  | $ 18,000,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low |  |  |  |  | $ 16,900,000 |  |  |
Contingent consideration |  | 8,400,000 | 17,070,000 | 0 |  |  |  |
ColdLight [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Payment of contingent consideration |  | 2,500,000 | 2,500,000 |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  | $ 5,000,000 |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low |  |  |  |  |  | $ 3,800,000 |  |
Contingent consideration |  | 0 | 2,500,000 | 4,000,000 |  |  |  |
ThingWorx [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Payment of contingent consideration | $ 9,000,000 | 0 | 9,000,000 |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  |  |  | $ 18,000,000
Contingent consideration |  | $ 0 | 0 | 9,000,000 |  |  |  |
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Derivative, Remaining Maturity |  | 15 months |  |  |  |  |  |
Accounting Standards Update 2015-03 [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  | 6,500,000 |  |  |  |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Deferred Tax Assets, Other |  | $ 77,000,000 |  |  |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated forfeiture adjustment |  | 1,000,000 |  |  |  |  |  |
Cash Provided For (Used In) Financing Activities [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Payment of contingent consideration |  | $ 11,000,000 | $ 10,600,000 | $ 4,300,000 |  |  |  |

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