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Acquisitions - Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Oct. 29, 2017 | Jul. 01, 2017 | Jan. 29, 2017
Business Acquisition [Line Items] |  |  |
Goodwill | $ 341,890 |  | $ 329,703
AptoVision Technologies Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Indefinite-lived intangible asset | 2,300 |  |
Goodwill | 12,187 | $ 12,187 |
Other (liabilities) assets, net | (3,868) |  |
Total consideration | 34,619 |  |
Developed Technology [Member] | AptoVision Technologies Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible asset | $ 20,000 |  |
Customer Relationships [Member] | AptoVision Technologies Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible asset, estimated useful life | 3 years |  |
Finite-lived intangible asset | $ 4,000 |  |
Minimum [Member] | Developed Technology [Member] | AptoVision Technologies Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible asset, estimated useful life | 6 years |  |
Maximum [Member] | Developed Technology [Member] | AptoVision Technologies Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible asset, estimated useful life | 7 years |  |

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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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