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Summary Of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |  |
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Sep. 30, 2018 USD ($) primary_source mo | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Oct. 01, 2017 USD ($) | Sep. 30, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Payment of contingent consideration | $ 8,925,000 | $ 12,100,000 |  |  |
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 | $ 1,700,000 | $ 700,000 |  |  |
Proceeds from sale of cost method investments |  | 13,700,000 |  |  |
Gain on sale of cost-method investments |  | 3,700,000 |  |  |
Allowance for doubtful accounts receivable | 600,000 | 1,100,000 | $ 1,000,000 |  | $ 1,000,000
Accounts receivable written-off, net of recoveries | 1,000,000 | 1,500,000 | 300,000 |  |
Bad debt expense including general and administrative expense | 500,000 | 1,500,000 | 300,000 |  |
Development costs for software | 0 | 0 | 0 |  |
Capitalized software in connection with acquisition | 800,000 | 6,000,000 |  |  |
Advertising expense | 2,900,000 | 2,500,000 | 2,100,000 |  |
Cumulative translation adjustment gains (loss) | 66,400,000 | (54,600,000) |  |  |
Pension benefits, before tax | 27,000,000 | 24,700,000 |  |  |
Pension benefits net of tax | 19,200,000 | 17,600,000 |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Before Tax | (400,000) | 1,800,000 |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (400,000) | 1,500,000 |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | (400,000) | (100,000) |  |  |
Deferred Tax Assets, Other | 1,152,000 | 6,599,000 |  |  |
Allowance for Sales Credits | 2,000,000 |  |  |  |
Deferred Revenue | $ 499,443,000 | 458,907,000 |  |  |
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 |  |  |  |
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative, Remaining Maturity | 14 months |  |  |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred Tax Assets, Other | $ 72,000,000 |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Windfall tax deductions not yet recognized |  |  |  | $ 37,000,000 |
Windfall Tax Deductions Not Yet Recognized Offset Valuation Allowance |  |  |  | 36,900,000 |
Excess Tax Benefit from Share-based Compensation, Operating Activities |  | 600,000 | 100,000 |  |
Excess tax benefits realized from stock-based awards |  | $ 600,000 | $ 100,000 |  |
Forfeiture adjustment |  |  |  | $ 700,000 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Commissions | 70,000,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Minimum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred Revenue | 350,000,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Maximum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred Revenue | $ 380,000,000 |  |  |  |

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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from recoveries of amounts previously written off or reestablishment of reserves that had previously been utilized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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