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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 25, 2016 | Sep. 26, 2015
Two Thousand Fifteen |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan |  | $ 18.9
Restructuring Reserve [Roll Forward] |  |
Period beginning balance | $ 5.7 |
Period end balance |  | 5.7
Two Thousand Fifteen | Restructuring Action Two Thousand Sixteen [Domain] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan |  | 0.0
Restructuring Reserve [Roll Forward] |  |
Period beginning balance | 0.0 |
Period end balance |  | 0.0
Two Thousand Fifteen | Fiscal 2015 Actions |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan |  | 10.0
Restructuring Reserve [Roll Forward] |  |
Period beginning balance | 3.1 |
Period end balance |  | 3.1
Two Thousand Fifteen | Fiscal 2014 Actions |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan |  | 8.0
Restructuring Reserve [Roll Forward] |  |
Period beginning balance | 2.5 |
Period end balance |  | 2.5
Two Thousand Fifteen | Other Operating Cost Reductions |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan |  | 0.9
Restructuring Reserve [Roll Forward] |  |
Period beginning balance | 0.1 |
Period end balance |  | $ 0.1
Two Thousand Sixteen [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan | 7.5 |
Restructuring Reserve [Roll Forward] |  |
Severance payments | 7.4 |
Other payments | 0.4 |
Period end balance | 5.4 |
Two Thousand Sixteen [Member] | Restructuring Action Two Thousand Sixteen [Domain] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan | 7.5 |
Restructuring Reserve [Roll Forward] |  |
Severance payments | 3.3 |
Other payments | 0.0 |
Period end balance | 4.2 |
Two Thousand Sixteen [Member] | Fiscal 2015 Actions |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan | 0.0 |
Restructuring Reserve [Roll Forward] |  |
Severance payments | 2.6 |
Other payments | 0.0 |
Period end balance | 0.5 |
Two Thousand Sixteen [Member] | Fiscal 2014 Actions |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan | 0.0 |
Restructuring Reserve [Roll Forward] |  |
Severance payments | 1.4 |
Other payments | 0.4 |
Period end balance | 0.7 |
Two Thousand Sixteen [Member] | Other Operating Cost Reductions |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charges Under Exit Or Disposal Plan | 0.0 |
Restructuring Reserve [Roll Forward] |  |
Severance payments | 0.1 |
Other payments | 0.0 |
Period end balance | $ 0.0 |

X
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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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