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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring Charges - USD ($) $ in Millions | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Fiscal 2019 charges: |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | $ 6.6 |  |
Severance payments | (7.7) |  |
Other payments | (2.1) |  |
Balance | 5.9 |  |
Fiscal 2019 charges: | Fiscal 2019 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 4.0 |  |
Severance payments | (3.0) |  |
Other payments | 0.0 |  |
Balance | 1.0 |  |
Fiscal 2019 charges: | Fiscal 2018 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 1.2 |  |
Severance payments | (3.9) |  |
Other payments | (0.5) |  |
Balance | 1.1 |  |
Fiscal 2019 charges: | Fiscal 2017 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Severance payments | (0.8) |  |
Other payments | 0.0 |  |
Balance | 0.0 |  |
Fiscal 2019 charges: | Previous Other Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 1.4 |  |
Severance payments | 0.0 |  |
Other payments | (1.6) |  |
Balance | 3.8 |  |
Fiscal 2018 charges: |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 9.1 |  |
Fiscal restructuring charges |  | $ 14.2 |
Stock-based compensation |  | (1.3) |
Severance payments |  | (13.7) |
Other payments |  | (1.6) |
Balance |  | 9.1 |
Fiscal 2018 charges: | Fiscal 2019 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.0 |  |
Fiscal restructuring charges |  | 0.0 |
Stock-based compensation |  | 0.0 |
Severance payments |  | 0.0 |
Other payments |  | 0.0 |
Balance |  | 0.0 |
Fiscal 2018 charges: | Fiscal 2018 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 4.3 |  |
Fiscal restructuring charges |  | 12.6 |
Stock-based compensation |  | (1.3) |
Severance payments |  | (6.8) |
Other payments |  | (0.2) |
Balance |  | 4.3 |
Fiscal 2018 charges: | Fiscal 2017 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.8 |  |
Fiscal restructuring charges |  | 0.0 |
Stock-based compensation |  | 0.0 |
Severance payments |  | (6.7) |
Other payments |  | 0.0 |
Balance |  | 0.8 |
Fiscal 2018 charges: | Previous Other Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | $ 4.0 |  |
Fiscal restructuring charges |  | 1.6 |
Stock-based compensation |  | 0.0 |
Severance payments |  | (0.2) |
Other payments |  | (1.4) |
Balance |  | 4.0 |
Fiscal 2017 charges: |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 11.5 |
Fiscal restructuring charges |  |  | $ 13.3
Severance payments |  |  | (6.6)
Other payments |  |  | (1.5)
Balance |  |  | 11.5
Fiscal 2017 charges: | Fiscal 2019 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 0.0 |
Fiscal restructuring charges |  |  | 0.0
Severance payments |  |  | 0.0
Other payments |  |  | 0.0
Balance |  |  | 0.0
Fiscal 2017 charges: | Fiscal 2018 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 0.0 |
Fiscal restructuring charges |  |  | 0.0
Severance payments |  |  | 0.0
Other payments |  |  | 0.0
Balance |  |  | 0.0
Fiscal 2017 charges: | Fiscal 2017 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 7.5 |
Fiscal restructuring charges |  |  | 8.5
Severance payments |  |  | (1.0)
Other payments |  |  | 0.0
Balance |  |  | 7.5
Fiscal 2017 charges: | Previous Other Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | $ 4.0 |
Fiscal restructuring charges |  |  | 4.8
Severance payments |  |  | (5.6)
Other payments |  |  | (1.5)
Balance |  |  | 4.0
Fiscal 2016 charges: |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 6.3
Fiscal 2016 charges: | Fiscal 2019 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2016 charges: | Fiscal 2018 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2016 charges: | Fiscal 2017 Actions |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2016 charges: | Previous Other Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | $ 6.3

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- Definition Payments to settle other restructuring charges. + References No definition available. + Details
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- Definition Total restructuring charges under exit or disposal plan. + References No definition available. + Details
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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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