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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring Charges - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Fiscal 2018 restructuring charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | $ 9.1
Fiscal 2018 restructuring charges | Fiscal 2021 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2018 restructuring charges | Fiscal 2020 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2018 restructuring charges | Fiscal 2019 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2018 restructuring charges | Fiscal 2018 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 4.3
Fiscal 2018 restructuring charges | Previous Other Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 4.8
Fiscal 2019 restructuring charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | $ 5.9 |
Fiscal restructuring charges |  |  | 6.6
Severance payments and adjustments |  |  | (7.7)
Other payments |  |  | (2.1)
Balance |  |  | 5.9
Fiscal 2019 restructuring charges | Fiscal 2021 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 0.0 |
Fiscal restructuring charges |  |  | 0.0
Severance payments and adjustments |  |  | 0.0
Other payments |  |  | 0.0
Balance |  |  | 0.0
Fiscal 2019 restructuring charges | Fiscal 2020 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 0.0 |
Fiscal restructuring charges |  |  | 0.0
Severance payments and adjustments |  |  | 0.0
Other payments |  |  | 0.0
Balance |  |  | 0.0
Fiscal 2019 restructuring charges | Fiscal 2019 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 1.0 |
Fiscal restructuring charges |  |  | 4.0
Severance payments and adjustments |  |  | (3.0)
Other payments |  |  | 0.0
Balance |  |  | 1.0
Fiscal 2019 restructuring charges | Fiscal 2018 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 1.1 |
Fiscal restructuring charges |  |  | 1.2
Severance payments and adjustments |  |  | (3.9)
Other payments |  |  | (0.5)
Balance |  |  | 1.1
Fiscal 2019 restructuring charges | Previous Other Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 3.8 |
Fiscal restructuring charges |  |  | 1.4
Severance payments and adjustments |  |  | (0.8)
Other payments |  |  | (1.6)
Balance |  |  | $ 3.8
Fiscal 2020 restructuring charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | $ 4.5 |  |
Fiscal restructuring charges | 8.7 | 15.3 |
Stock-based compensation |  | (7.5) |
Severance payments and adjustments |  | (5.9) |
Other payments |  | (3.3) |
Balance |  | 4.5 |
Fiscal 2020 restructuring charges | Fiscal 2021 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.0 |  |
Fiscal restructuring charges |  | 0.0 |
Stock-based compensation |  | 0.0 |
Severance payments and adjustments |  | 0.0 |
Other payments |  | 0.0 |
Balance |  | 0.0 |
Fiscal 2020 restructuring charges | Fiscal 2020 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 3.7 |  |
Fiscal restructuring charges |  | 15.1 |
Stock-based compensation |  | (7.5) |
Severance payments and adjustments |  | (4.4) |
Other payments |  | 0.5 |
Balance |  | 3.7 |
Fiscal 2020 restructuring charges | Fiscal 2019 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.0 |  |
Fiscal restructuring charges |  | 0.3 |
Stock-based compensation |  | 0.0 |
Severance payments and adjustments |  | (1.3) |
Other payments |  | 0.0 |
Balance |  | 0.0 |
Fiscal 2020 restructuring charges | Fiscal 2018 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.8 |  |
Fiscal restructuring charges |  | (0.1) |
Stock-based compensation |  | 0.0 |
Severance payments and adjustments |  | (0.2) |
Other payments |  | 0.0 |
Balance |  | 0.8 |
Fiscal 2020 restructuring charges | Previous Other Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.0 |  |
Fiscal restructuring charges |  | 0.0 |
Stock-based compensation |  | 0.0 |
Severance payments and adjustments |  | 0.0 |
Other payments |  | (3.8) |
Balance |  | $ 0.0 |
Fiscal 2021 restructuring charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 9.3 |  |
Stock-based compensation | (0.9) |  |
Severance payments and adjustments | (8.8) |  |
Balance | 4.1 |  |
Fiscal 2021 restructuring charges | Fiscal 2021 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 8.7 |  |
Stock-based compensation | (0.9) |  |
Severance payments and adjustments | (4.6) |  |
Balance | 3.2 |  |
Fiscal 2021 restructuring charges | Fiscal 2020 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.6 |  |
Stock-based compensation | 0.0 |  |
Severance payments and adjustments | (3.4) |  |
Balance | 0.9 |  |
Fiscal 2021 restructuring charges | Fiscal 2019 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Stock-based compensation | 0.0 |  |
Severance payments and adjustments | 0.0 |  |
Balance | 0.0 |  |
Fiscal 2021 restructuring charges | Fiscal 2018 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Stock-based compensation | 0.0 |  |
Severance payments and adjustments | (0.8) |  |
Balance | 0.0 |  |
Fiscal 2021 restructuring charges | Previous Other Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Stock-based compensation | 0.0 |  |
Severance payments and adjustments | 0.0 |  |
Balance | $ 0.0 |  |

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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