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Shareholder's Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 24, 2020 | Nov. 18, 2019 | Jul. 24, 2018 | Jan. 03, 2021 | Dec. 29, 2019 | Sep. 30, 2020
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Common stock repurchase program, approved amount |  |  | $ 1,000,000,000 |  |  |
Common stock repurchase program, authorization period |  |  | 36 months |  |  |
Shares repurchased (in shares) |  |  |  | 0.6 | 3.2 |
Repurchase amount, fair value |  |  |  | $ 42,300,000 |  |
Average cost per share (in dollars per share) |  |  |  | $ 65.27 | $ 61.92 |
ASR |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Repurchase payment |  | $ 125,000,000.0 |  |  |  |
Shares repurchased (in shares) | 0.3 | 1.7 |  | 0.0 | 1.7 | 2.0
Percentage of total shares |  | 85.00% |  |  |  |
Repurchase amount, fair value | $ 18,500,000 | $ 106,300,000 |  |  | $ 125,000,000.0 |
Reduction to additional paid-in capital |  | $ 18,700,000 |  |  |  |
Average cost per share (in dollars per share) |  |  |  | $ 0 | $ 61.79 | $ 61.59

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