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Restructuring Charges - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Jun. 30, 2018	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 29, 2018
Restructuring Cost and Reserve [Line Items]
Severance charges						$ 9.0
Incremental cost						1.3
Cynosure
Restructuring Cost and Reserve [Line Items]
Severance charges		$ 1.3	$ 4.3	$ 1.5
Bedford
Restructuring Cost and Reserve [Line Items]
Facility closure costs	$ 1.6		$ 1.3		$ 3.5
International
Restructuring Cost and Reserve [Line Items]
Severance charges						0.6
Estimated severance and benefits future costs						2.2
Hicksville
Restructuring Cost and Reserve [Line Items]
Severance charges						0.3
Estimated severance and benefits future costs						0.5
Restructuring Charges | San Diego
Restructuring Cost and Reserve [Line Items]
Severance charges		1.4
Restructuring Charges | Bedford
Restructuring Cost and Reserve [Line Items]
Severance charges						$ 1.7
Restructuring Charges | International
Restructuring Cost and Reserve [Line Items]
Severance charges		$ 7.9

X

- Definition

Estimated severance and benefits future costs

+ 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

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+ References

No definition available.

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- Definition

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.

+ 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 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&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
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-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 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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