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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2019 | Oct. 01, 2018 | Sep. 30, 2016
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Contract with customer, refund liability | $ 22,900,000 |  |  |  |  |
Cost method investments | 9,400,000 | $ 1,700,000 |  |  |  |
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 | 700,000 | 600,000 | $ 1,100,000 |  |  | $ 1,000,000.0
Allowance for credit loss, writeoff | 200,000 | 1,000,000.0 | 1,500,000 |  |  |
Bad debt expense including general and administrative expense | 300,000 | 500,000 | 1,500,000 |  |  |
Development costs for software | 0 | 0 | 0 |  |  |
Capitalized software in connection with acquisition |  | 800,000 |  |  |  |
Advertising expense | 3,600,000 | 2,900,000 | 2,500,000 |  |  |
Cumulative translation adjustment gains (loss) | 91,200,000 | 66,400,000 |  |  |  |
Pension benefits, before tax | (34,900,000) | 27,000,000.0 |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (24,800,000) | 19,200,000 |  |  |  |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax | 100,000 | (400,000) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Before Tax |  | (400,000) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax |  | (400,000) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Before Tax | (6,800,000) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Effect Net of Tax | $ (5,100,000) |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1.0 |  |  |  |  |
Deferred Tax Assets, Other | $ 1,623,000 | 1,152,000 |  |  |  |
Total stockholders’ equity | 1,201,998,000 | 874,589,000 | 885,436,000 |  |  | 842,666,000
Deferred tax assets | 198,634,000 | 165,566,000 |  |  |  |
Other income (expense), net | $ 305,000 | (2,284,000) | (772,000) |  |  |
Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percent of standalone selling price for subscriptions that contains license | 50.00% |  |  |  |  |
Percent of standalone selling price for subscriptions that contains support | 45.00% |  |  |  |  |
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] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percent of standalone selling price for subscriptions that contains license | 55.00% |  |  |  |  |
Percent of standalone selling price for subscriptions that contains support | 50.00% |  |  |  |  |
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 |  |  |  |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative maturity | 3 months |  |  |  |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Deferred tax assets |  |  |  |  | $ 75,300,000 |
Other Tax Assets |  |  |  |  | 6,000,000.0 |
Other Tax Liabilities |  |  |  |  | 3,000,000.0 |
Accounting Standards Update 2017-07 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Other income (expense), net |  | 600,000 | 900,000 |  |  |
Accounting Standards Update 2016-02 [Member] | Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating Lease, Liability |  |  |  | $ 233,000,000 |  |
Operating Lease, Right-of-Use Asset |  |  |  | 162,000,000 |  |
Accounting Standards Update 2016-02 [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating Lease, Liability |  |  |  | 238,000,000 |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 167,000,000 |  |
Accumulated Deficit [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Total stockholders’ equity | $ (191,390,000) | (599,409,000) | $ (650,840,000) |  |  | $ (657,079,000)
Accumulated Deficit [Member] | Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Total stockholders’ equity |  |  |  |  | $ 72,300,000 |
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative maturity | 3 months |  |  |  |  |
Derivative, remaining maturity | 3 months |  |  |  |  |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative, remaining maturity | 15 months |  |  |  |  |
Other Current Assets [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted Cash | $ 1,100,000 | $ 1,100,000 |  |  |  |

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