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Revenue from Contracts with Customers Revenue from Contracts with Customers (Additional Information) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Contract with Customer, Refund Liability | $ 23,400 |  |
Contract with Customer, Asset, Reclassified to Receivable | 14,100 |  |
Contract with Customer, Asset, Additions during Period | 7,500 |  |
Deferred Revenue, Revenue Recognized | 246,100 |  |
Deferred Revenue, Additions | $ 280,400 |  |
Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 367,378
Accounting Standards Update 2014-09 | Accumulated Deficit |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect Of New Accounting Principle In Period Of Adoption, Gross |  | $ 431,900 |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 367,400 | $ 367,378
Cumulative Effect Of New Accounting Principle In Period Of Adoption, Related To Deferral Of Commission Expenses |  | 70,000 |
Cumulative Effect Of New Accounting Principle In Period Of Adoption, Related To Offsetting Current Liability |  | $ 2,800 |
Minimum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [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% |  |
Maximum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [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% |  |
Other Current Assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Capitalized Contract Cost, Net | $ 20,100 |  |
Other Assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Capitalized Contract Cost, Net | $ 57,600 |  |

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