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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring Charges [Member] - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Two Thousand Seventeen [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | $ 13.3 |  |
Severance payments | (6.6) |  |
Other payments | (1.5) |  |
Balance | 11.5 |  |
Two Thousand Seventeen [Member] | Fiscal 2017 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 8.5 |  |
Severance payments | (1.0) |  |
Other payments | 0.0 |  |
Balance | 7.5 |  |
Two Thousand Seventeen [Member] | Fiscal 2016 Actions [Domain] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 4.8 |  |
Severance payments | (5.4) |  |
Other payments | (1.2) |  |
Balance | 3.7 |  |
Two Thousand Seventeen [Member] | Fiscal 2015 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Severance payments | (0.2) |  |
Other payments | 0.0 |  |
Balance | 0.0 |  |
Two Thousand Seventeen [Member] | Fiscal 2014 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Severance payments | 0.0 |  |
Other payments | (0.3) |  |
Balance | 0.3 |  |
Two Thousand Seventeen [Member] | Other Operating Cost Reductions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Fiscal restructuring charges | 0.0 |  |
Severance payments | 0.0 |  |
Other payments | 0.0 |  |
Balance | 0.0 |  |
Fiscal 2016 Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 6.3 |  |
Fiscal restructuring charges |  | $ 10.5 |
Stock-based compensation |  | (0.4) |
Severance payments |  | (9.0) |
Other payments |  | (0.5) |
Balance |  | 6.3 |
Fiscal 2016 Charges [Member] | Fiscal 2017 Actions [Member] |  |  |
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 2016 Charges [Member] | Fiscal 2016 Actions [Domain] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 5.5 |  |
Fiscal restructuring charges |  | 10.5 |
Stock-based compensation |  | (0.4) |
Severance payments |  | (4.6) |
Other payments |  | 0.0 |
Balance |  | 5.5 |
Fiscal 2016 Charges [Member] | Fiscal 2015 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.2 |  |
Fiscal restructuring charges |  | 0.0 |
Stock-based compensation |  | 0.0 |
Severance payments |  | (2.9) |
Other payments |  | 0.0 |
Balance |  | 0.2 |
Fiscal 2016 Charges [Member] | Fiscal 2014 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | 0.6 |  |
Fiscal restructuring charges |  | 0.0 |
Stock-based compensation |  | 0.0 |
Severance payments |  | (1.4) |
Other payments |  | (0.5) |
Balance |  | 0.6 |
Fiscal 2016 Charges [Member] | Other Operating Cost Reductions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance | $ 0.0 |  |
Fiscal restructuring charges |  | 0.0 |
Stock-based compensation |  | 0.0 |
Severance payments |  | (0.1) |
Other payments |  | 0.0 |
Balance |  | 0.0 |
Fiscal 2015 Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 5.7 |
Fiscal restructuring charges |  |  | $ 18.9
Stock-based compensation |  |  | (4.1)
Severance payments |  |  | (23.9)
Other payments |  |  | (2.1)
Balance |  |  | 5.7
Fiscal 2015 Charges [Member] | Fiscal 2017 Actions [Member] |  |  |
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 2015 Charges [Member] | Fiscal 2016 Actions [Domain] |  |  |
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 2015 Charges [Member] | Fiscal 2015 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 3.1 |
Fiscal restructuring charges |  |  | 10.0
Stock-based compensation |  |  | (4.1)
Severance payments |  |  | (2.8)
Other payments |  |  | 0.0
Balance |  |  | 3.1
Fiscal 2015 Charges [Member] | Fiscal 2014 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | 2.5 |
Fiscal restructuring charges |  |  | 8.0
Stock-based compensation |  |  | 0.0
Severance payments |  |  | (16.2)
Other payments |  |  | (1.3)
Balance |  |  | 2.5
Fiscal 2015 Charges [Member] | Other Operating Cost Reductions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  | $ 0.1 |
Fiscal restructuring charges |  |  | 0.9
Stock-based compensation |  |  | 0.0
Severance payments |  |  | (4.9)
Other payments |  |  | (0.8)
Balance |  |  | 0.1
Fiscal 2014 Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 16.9
Fiscal 2014 Charges [Member] | Fiscal 2017 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2014 Charges [Member] | Fiscal 2016 Actions [Domain] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2014 Charges [Member] | Fiscal 2015 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 0.0
Fiscal 2014 Charges [Member] | Fiscal 2014 Actions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | 12.0
Fiscal 2014 Charges [Member] | Other Operating Cost Reductions [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance |  |  | $ 4.9

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- Definition Severance payments. + References No definition available. + Details
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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 Share based compensation expense included other restructuring costs. + 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://www.xbrl.org/2003/role/presentationRef -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=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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