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Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2019 | Apr. 01, 2018 | Dec. 30, 2018 | Oct. 01, 2018 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred Tax Assets, Net, Noncurrent | $ 1,006.6 |  | $ 1,006.6 |  |  | $ 123.7 | $ 134.7
Deferred Revenue, Current | 1,311.4 |  | 1,311.4 |  |  | 1,220.9 | 1,642.9
Income Tax Expense (Benefit) | $ 161.2 | $ 155.8 | $ 366.4 | $ 911.6 |  |  |
Earnings per share - diluted | $ 0.53 | $ 0.47 | $ 1.14 | $ 2.05 |  |  |
Earnings Per Share, Basic | $ 0.54 | $ 0.47 | $ 1.15 | $ 2.07 |  |  |
Deferred Revenue, Noncurrent | $ 6,761.9 |  | $ 6,761.9 |  |  | 6,839.7 | 6,775.7
Deferred Tax and Other Liabilities, Noncurrent | 1,500.3 |  | 1,500.3 |  |  | 1,509.5 | 1,430.5
Retained Earnings (Accumulated Deficit) | $ (4,807.7) |  | $ (4,807.7) |  |  | $ 1,725.4 | 1,457.4
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ 227.6 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred Tax Assets, Net, Noncurrent |  |  |  |  |  |  | (11.0)
Deferred Revenue, Current |  |  |  |  |  |  | (422.0)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ 268.0 |  |
Deferred Revenue, Noncurrent |  |  |  |  |  |  | 64.0
Deferred Tax and Other Liabilities, Noncurrent |  |  |  |  |  |  | 79.0
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  | $ 268.0

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