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Acquisitons - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 09, 2017 | Jul. 31, 2017 | May 26, 2017 | Jan. 26, 2017 | Jun. 29, 2018 | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interests issued and issuable |  |  |  | $ 465,100 |  | $ 0 | $ 0 | $ 465,082
Purchase price holdback |  |  |  |  |  | 0 | 375 |
Goodwill |  |  |  |  |  | 314,727 | 314,076 |
Contingent consideration |  |  |  |  |  | 0 | 585 |
Applied Micro Circuits Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate consideration |  |  |  | 695,400 |  |  | 695,380 |
Cash paid |  |  |  | 287,100 |  |  |  |
Cash acquired from acquisition |  |  |  | 56,800 |  |  |  |
Equity interests issued and issuable |  |  |  | 465,100 |  |  |  |
Equity interests issued and issuable |  |  |  | 453,632 |  |  |  |
Transaction costs |  |  |  |  |  | $ 0 | 0 | 11,900
Payments to acquire businesses |  |  |  | 287,060 |  |  |  |
Goodwill |  |  |  |  |  |  | 184,629 |
Intangible assets |  |  |  |  |  |  | 412,848 |
Applied Micro Circuits Corporation | Equity Issuance Costs |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  | 1,000
Picometrix |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate consideration | $ 29,500 |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  | 0 | $ 200
Payments to acquire businesses | 33,500 |  |  |  | $ 33,500 |  |  |
Indemnification assets | $ 4,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 7,769 |  |  |
Intangible assets |  |  |  |  | $ 19,000 |  |  |
Antario |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate consideration |  | $ 4,800 |  |  |  |  |  |
Payments to acquire businesses |  | 5,800 |  |  |  |  |  |
Purchase price holdback |  | $ 1,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 1,600 |
Intangible assets |  |  |  |  |  |  | 4,100 |
Triple Play Communications |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate consideration |  |  | $ 2,200 |  |  |  |  |
Payments to acquire businesses |  |  | 2,600 |  |  |  |  |
Goodwill |  |  |  |  |  |  | 3,700 |
Intangible assets |  |  |  |  |  |  | 200 |
Contingent consideration |  |  | $ 400 |  |  |  |  |
Employee Stock Options And Restricted Stock | Applied Micro Circuits Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interest issued or issuable value assigned |  |  |  | 14,500 |  |  |  |
Equity interests issued and issuable |  |  |  | $ 9,300 |  |  | $ 9,307 |

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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