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Restructuring and Divestiture Charges - Charges Taken Related to Restructuring Actions (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 24, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Fiscal restructuring and divestiture charges | $ 2.5 | $ 6.0 | $ 1.6 | $ 3.2 | $ 2.9 | $ 3.8 | $ 2.3 | $ 13.3 | $ 10.5 | $ 28.5
Fiscal 2015 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  |  | 16.3
Facility closure costs |  |  |  |  |  |  |  |  |  | 2.6
Fiscal restructuring charges |  |  |  |  |  |  |  |  |  | 18.9
Divestiture net charges |  |  |  |  |  |  |  |  |  | 9.6
Fiscal restructuring and divestiture charges |  |  |  |  |  |  |  |  |  | 28.5
Fiscal 2016 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  | 10.5 |
Fiscal restructuring charges |  |  |  |  |  |  |  |  | 10.5 |
Two Thousand Seventeen [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  | 8.5 |  |
Facility closure costs |  |  |  |  |  |  |  | 4.8 |  |
Other |  |  |  |  |  |  |  | 0.0 |  |
Fiscal restructuring charges |  |  |  |  |  |  |  | 13.3 |  |
Fiscal 2017 Actions [Member] | Fiscal 2015 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  |  | 0.0
Facility closure costs |  |  |  |  |  |  |  |  |  | 0.0
Fiscal restructuring charges |  |  |  |  |  |  |  |  |  | 0.0
Fiscal 2017 Actions [Member] | Fiscal 2016 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  | 0.0 |
Fiscal restructuring charges |  |  |  |  |  |  |  |  | 0.0 |
Fiscal 2017 Actions [Member] | Two Thousand Seventeen [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  | 8.5 |  |
Facility closure costs |  |  |  |  |  |  |  | 0.0 |  |
Other |  |  |  |  |  |  |  | 0.0 |  |
Fiscal restructuring charges |  |  |  |  |  |  |  | 8.5 |  |
Fiscal 2016 Actions [Domain] | Fiscal 2015 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  |  | 0.0
Facility closure costs |  |  |  |  |  |  |  |  |  | 0.0
Fiscal restructuring charges |  |  |  |  |  |  |  |  |  | 0.0
Fiscal 2016 Actions [Domain] | Fiscal 2016 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  | 10.5 |
Fiscal restructuring charges |  |  |  |  |  |  |  |  | 10.5 |
Fiscal 2016 Actions [Domain] | Two Thousand Seventeen [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  | 0.0 |  |
Facility closure costs |  |  |  |  |  |  |  | 4.8 |  |
Other |  |  |  |  |  |  |  | 0.0 |  |
Fiscal restructuring charges |  |  |  |  |  |  |  | 4.8 |  |
Fiscal 2015 Actions [Member] | Fiscal 2015 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  |  | 10.0
Facility closure costs |  |  |  |  |  |  |  |  |  | 0.0
Fiscal restructuring charges |  |  |  |  |  |  |  |  |  | 10.0
Fiscal 2015 Actions [Member] | Fiscal 2016 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  | 0.0 |
Fiscal restructuring charges |  |  |  |  |  |  |  |  | 0.0 |
Fiscal 2015 Actions [Member] | Two Thousand Seventeen [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  | 0.0 |  |
Facility closure costs |  |  |  |  |  |  |  | 0.0 |  |
Other |  |  |  |  |  |  |  | 0.0 |  |
Fiscal restructuring charges |  |  |  |  |  |  |  | 0.0 |  |
Fiscal 2014 Actions [Member] | Fiscal 2015 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  |  | 6.0
Facility closure costs |  |  |  |  |  |  |  |  |  | 2.0
Fiscal restructuring charges |  |  |  |  |  |  |  |  |  | 8.0
Fiscal 2014 Actions [Member] | Fiscal 2016 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  | 0.0 |
Fiscal restructuring charges |  |  |  |  |  |  |  |  | 0.0 |
Fiscal 2014 Actions [Member] | Two Thousand Seventeen [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  | 0.0 |  |
Facility closure costs |  |  |  |  |  |  |  | 0.0 |  |
Other |  |  |  |  |  |  |  | 0.0 |  |
Fiscal restructuring charges |  |  |  |  |  |  |  | 0.0 |  |
Other Operating Cost Reductions [Member] | Fiscal 2015 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  |  | 0.3
Facility closure costs |  |  |  |  |  |  |  |  |  | 0.6
Fiscal restructuring charges |  |  |  |  |  |  |  |  |  | $ 0.9
Other Operating Cost Reductions [Member] | Fiscal 2016 Charges [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |  | 0.0 |
Fiscal restructuring charges |  |  |  |  |  |  |  |  | $ 0.0 |
Other Operating Cost Reductions [Member] | Two Thousand Seventeen [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  | 0.0 |  |
Facility closure costs |  |  |  |  |  |  |  | 0.0 |  |
Other |  |  |  |  |  |  |  | 0.0 |  |
Fiscal restructuring charges |  |  |  |  |  |  |  | $ 0.0 |  |

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- Definition Represents charges incurred to close or restructure a facility in connection with an exit or disposal activity. Such costs include clean-up costs and lease obligations. Costs are recorded as the activities are incurred except for lease obligation charges, which are recorded upon termination of the lease obligation or at the cease use date. + References No definition available. + Details
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- Definition Represents severance and related benefit charges for the termination of employees under an exit or disposal activity. Charges are recorded either as one-time termination benefits, which are recognized ratable over the required service period to receive such benefit, or under an ongoing benefit plan arrangement once the charge is probable and reasonably estimable. + 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 Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: 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 + Details
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