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Commitments and Contingencies - Activity Related to Warranty Accrual (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Standard Product Warranty Accrual, Additions from Business Acquisition | [1] | $ 0 | $ 0 | $ 2,186 | $ 0
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | 10,505 | 6,622 | 8,464 | 6,907
Provision |  | 2,433 | 2,823 | 6,051 | 5,619
Warranty usage | [2] | (2,659) | (1,598) | (6,422) | (4,679)
Balance at end of period |  | $ 10,279 | $ 7,847 | $ 10,279 | $ 7,847
[1] | (1)Warranty assumed as part of the acquisition of the iRobot-related distribution business of Sales On Demand Corporation (see Note 9).
[2] | Warranty usage includes costs incurred for warranty obligations and, for the nine month period ended October 1, 2016, the release of warranty liabilities associated with the divestiture of the defense and security business unit.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the standard product warranty accrual from a business acquisition. Excludes extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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