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v3.20.2

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Oct. 01, 2018
Revenue from External Customer [Line Items] |  |  |
Contract with customer, asset, expected to be transferred to receivables within the next 12 months and therefore | $ 6,900,000 |  |
Contract with customer, asset, reclassified to receivable | 15,100,000 |  |
Contract with customer, asset, decrease in contract assets | (9,000,000.0) |  |
Contract with customer, asset, increase in contract assets related to revenue recognized | 6,100,000 |  |
Deferred revenue, revenue recognized | 379,800,000 |  |
Deferred revenue, additions | 409,700,000 |  |
Short term and long term accounts receivable | $ 511,300,000 | $ 412,500,000 |
Capitalized contract cost, amortization period | 5 years |  |
Amortization expense related to costs to obtain a contract with a customer | $ 36,200,000 | 30,400,000 |
Impairments of the contract cost asset | 0 | 0 |
Deferred revenue | 426,465,000 | 396,632,000 |
Revenue, remaining performance obligation, amount | 1,220,900,000 |  |
Unrecorded |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue, remaining performance obligation, amount | 794,400,000 |  |
Other Assets |  |  |
Revenue from External Customer [Line Items] |  |  |
Capitalized contract cost, net | 72,900,000 | 64,800,000 |
Other Current Assets |  |  |
Revenue from External Customer [Line Items] |  |  |
Capitalized contract cost, net | $ 33,900,000 | $ 27,700,000 |
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Revenue from External Customer [Line Items] |  |  |
Cumulative effect of new accounting principle |  |  | $ 363,200,000
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201409Member |  |
Accumulated Deficit | Revenue from Contract with Customer Benchmark | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Revenue from External Customer [Line Items] |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201409Member |  |
Accumulated Deficit | Deferred Revenue | Revenue from Contract with Customer Benchmark | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Revenue from External Customer [Line Items] |  |  |
Cumulative effect of new accounting principle |  |  | 143,200,000
Accumulated Deficit | Other Assets | Revenue from Contract with Customer Benchmark | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Revenue from External Customer [Line Items] |  |  |
Cumulative effect of new accounting principle |  |  | 5,100,000
Accumulated Deficit | Unbilled Contracts Receivables | Revenue from Contract with Customer Benchmark | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Revenue from External Customer [Line Items] |  |  |
Cumulative effect of new accounting principle |  |  | 218,500,000
Accounting Standards Update 2014-09 | Accumulated Deficit |  |  |
Revenue from External Customer [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption, related to offsetting current liability |  |  | 2,800,000
Cumulative effect of new accounting principle in period of adoption, gross |  |  | 432,200,000
Cumulative effect of new accounting principle in period of adoption, related to deferral of commission expenses |  |  | 70,000,000.0
Accounting Standards Update 2014-09 | Accumulated Deficit | Revenue from Contract with Customer Benchmark | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Revenue from External Customer [Line Items] |  |  |
Cumulative effect of new accounting principle |  |  | $ 366,800,000

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