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Restructuring and Divestiture Charges - Charges Taken Related to Restructuring Actions (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 26, 2016	Mar. 28, 2015	Mar. 26, 2016	Mar. 28, 2015	Sep. 26, 2015
Restructuring Cost and Reserve [Line Items]
Fiscal restructuring and divestiture charges	$ 3.8	$ 2.0	$ 6.0	$ 10.0
Restructuring | Two Thousand Fifteen [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
Restructuring | Year Two Thousand Sixteen [Domain]
Restructuring Cost and Reserve [Line Items]
Workforce reductions			6.0
Fiscal restructuring charges			6.0
Restructuring | Fiscal 2016 Actions [Domain] | Two Thousand Fifteen [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions					0.0
Facility closure costs					0.0
Fiscal restructuring charges					0.0
Restructuring | Fiscal 2016 Actions [Domain] | Year Two Thousand Sixteen [Domain]
Restructuring Cost and Reserve [Line Items]
Workforce reductions			6.0
Fiscal restructuring charges			6.0
Restructuring | Fiscal 2015 Actions | Two Thousand Fifteen [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions					10.0
Facility closure costs					0.0
Fiscal restructuring charges					10.0
Restructuring | Fiscal 2015 Actions | Year Two Thousand Sixteen [Domain]
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Fiscal restructuring charges			0.0
Restructuring | Fiscal 2014 Actions | Two Thousand Fifteen [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions					6.0
Facility closure costs					2.0
Fiscal restructuring charges					8.0
Restructuring | Fiscal 2014 Actions | Year Two Thousand Sixteen [Domain]
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Fiscal restructuring charges			0.0
Restructuring | Other Operating Cost Reductions | Two Thousand Fifteen [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions					0.3
Facility closure costs					0.6
Fiscal restructuring charges					$ 0.9
Restructuring | Other Operating Cost Reductions | Year Two Thousand Sixteen [Domain]
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Fiscal restructuring charges			$ 0.0

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- Definition

Divestiture charges, net.

+ References

No definition available.

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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.

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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

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- Definition

Total restructuring charges under exit or disposal plan.

+ References

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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 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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 S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

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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.

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