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Restructuring and Divestiture Charges - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 26, 2015	Jun. 27, 2015	Dec. 27, 2014	Sep. 27, 2014	Sep. 26, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 1.7
Loss on disposal of business				$ 5.3
Restructuring Reserve, Translation and Other Adjustment		$ 9.6
Restructuring | Bedford [Member]
Restructuring Cost and Reserve [Line Items]
Severance charges	0.5
Restructuring | International [Member]
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 1.8
Restructuring | Fiscal 2015 charges:
Restructuring Cost and Reserve [Line Items]
Severance charges			$ 2.5		$ 10.0
Share Based Compensation Expense Included Other Restructuring Costs					4.1
Restructuring | Fiscal 2014 Charges [Member]
Restructuring Cost and Reserve [Line Items]
Severance charges			$ 2.5		6.0
Facility closure costs					$ 2.0
Number Office Locations related to Facility Closure Costs					0.0

X

- 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.

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Number Office Locations related to Facility Closure Costs

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Share based compensation expense included other restructuring costs.

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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- Definition

Amount expected to be recognized in earnings for the specified restructuring cost.

+ References

Reference 1: 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

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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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Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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