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Components of Intangible Assets and Their Estimated Useful Lives at Acquisition Date (Detail) - Mobile Industrial Robots (MiR) - USD ($) $ in Thousands |  | 6 Months Ended
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Apr. 25, 2018 | Jul. 01, 2018
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | $ 79,660 | $ 79,700
Total intangible assets, estimated useful life, years | 7 years 4 months 24 days |
Developed technology |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | $ 63,820 |
Total intangible assets, estimated useful life, years | 7 years |
Trademarks and tradenames |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | $ 12,060 |
Total intangible assets, estimated useful life, years | 11 years |
Customer Relationships |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | $ 3,770 |
Total intangible assets, estimated useful life, years | 2 years 6 months |
Customer backlog |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | $ 10 |
Total intangible assets, estimated useful life, years | 2 months 12 days |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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