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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Oct. 01, 2019 | Dec. 29, 2018 | Sep. 30, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percent of standalone selling price for subscriptions that contains software license | 55.00% |  |  |  |  |
Percent of standalone selling price for subscriptions that contains support | 45.00% |  |  |  |  |
Contract with customer, refund liability | $ 34,500,000 | $ 22,900,000 |  |  |  |
Impairment charges | 500,000 |  |  |  |  |
Non-marketable equity investments | 8,900,000 | 9,400,000 |  |  |  |
Allowance for doubtful accounts receivable | 500,000 | 700,000 | $ 600,000 |  |  |
Allowance for credit loss, writeoff | 200,000 | 200,000 | 1,000,000.0 |  |  |
Bad debt expense including general and administrative expense | $ 0.0 | 300,000 | 500,000 |  |  |
Lease expiration date | 2037 |  |  |  |  |
Development costs for software | $ 0 | 0 | 0 |  |  |
Advertising expense | 3,800,000 | 3,600,000 | 2,900,000 |  |  |
Cumulative translation adjustment gains (loss) | (69,100,000) | (91,200,000) |  |  |  |
Pension benefits, before tax | (37,200,000) | (34,900,000) |  |  |  |
Accumulated other comprehensive (income) loss, defined benefit plan, after tax | 26,400,000 | 24,800,000 |  |  |  |
AOCI, Debt Securities, Available-for-sale, Adjustment, before tax | 300,000 | 100,000 |  |  |  |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax | 300,000 | 100,000 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Before Tax | (8,200,000) | 6,800,000 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Effect Net of Tax | (8,200,000) | $ 5,100,000 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 1.0 |  |  |  |
Operating lease, liability | 215,023,000 |  |  |  |  |
Operating right-of-use lease assets | 149,933,000 | $ 0 |  |  |  |
Total stockholders’ equity | 1,438,248,000 | 1,201,998,000 | 874,589,000 |  |  | $ 885,436,000
Purchased Software |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired | $ 11,500,000 |  |  |  |  |
Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percent of standalone selling price for subscriptions | 5.00% |  |  |  |  |
Minimum | Computer Hardware And Software |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period (in years) | 3 years |  |  |  |  |
Minimum | Furniture And Fixtures |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period (in years) | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percent of standalone selling price for subscriptions | 50.00% |  |  |  |  |
Maximum | Purchased Software |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period (in years) | 16 years |  |  |  |  |
Maximum | Customer Lists |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period (in years) | 12 years |  |  |  |  |
Maximum | Trademarks And Trade Names |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period (in years) | 12 years |  |  |  |  |
Maximum | Computer Hardware And Software |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period (in years) | 5 years |  |  |  |  |
Maximum | Furniture And Fixtures |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period (in years) | 7 years |  |  |  |  |
Accumulated Deficit |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Total stockholders’ equity | $ (62,267,000) | $ (191,390,000) | $ (599,409,000) |  |  | $ (650,840,000)
Accounting Standards Update 2016-16 | Accumulated Deficit |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Total stockholders’ equity |  |  |  |  | $ 72,300,000 |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating lease, liability |  |  |  | $ 224,000,000.0 |  |
Operating right-of-use lease assets |  |  |  | 167,900,000 |  |
Accounting Standards Update 2016-02 | Accumulated Deficit | Scheduling of Reversal of Temporary Tax Differences | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Total stockholders’ equity |  |  |  | $ (1,600,000) |  |
Not Designated as Hedging Instrument | Foreign Exchange Forward |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative maturity | 3 months |  |  |  |  |
Net Investment Hedging | Designated as Hedging Instrument | Foreign Exchange Forward |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative maturity | 3 months |  |  |  |  |

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