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Acquisition Acquisition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 25, 2018 | Sep. 24, 2017 | Sep. 25, 2016 | Mar. 25, 2018 | Mar. 26, 2017 | Jun. 26, 2016 | Mar. 06, 2018 | Jun. 25, 2017
Purchase Price Allocation [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  | $ 246,000 |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 4,191 |  |  |  |  |  |  |
Business Acquisition, Transaction Costs | $ 3,100 |  |  | $ 3,100 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  |  |  |  |  | 24,931 |
Business Acquisition, Date of Acquisition Agreement | Mar. 06, 2018 |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Infineon Technologies AG (Infineon) Radio Frequency Power Business (RF Power) |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 427,000 |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  | $ 1,900 | $ 2,800 | 1,850 | $ 2,775 |  |  |
Cash consideration paid to shareholders |  |  |  |  |  | $ 13,800 |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | $ 4,600 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | 10,504 |
Goodwill, Acquired During Period | 246,278 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  | 430,713 |
Finite-Lived Intangible Assets, Gross |  |  |  |  |  |  | 149,000 |
Goodwill | 617,651 |  |  | $ 617,651 |  |  |  | $ 618,828
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  | (39) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  |  |  |  |  |  | (3,264) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities |  |  |  |  |  |  | (290) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  | (3,593) |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  | 427,120 |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | $ (2,325) |  |  |  |  |  |  |
Developed technology |  |  |  |  |  |  |  |
Purchase Price Allocation [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  |  |  |  |  | 44,000 |
Finite-Lived Intangible Asset, Useful Life | 14 years |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |
Purchase Price Allocation [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  |  |  |  |  | 92,000 |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  |  |  |  |  |
Leases, Acquired-in-Place, Market Adjustment [Member] |  |  |  |  |  |  |  |
Purchase Price Allocation [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  |  |  |  |  | 1,000 |
Leases, Acquired-in-Place [Member] |  |  |  |  |  |  |  |
Purchase Price Allocation [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |  |  |  |  |
Non-compete agreements |  |  |  |  |  |  |  |
Purchase Price Allocation [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  |  |  |  |  | $ 12,000 |
Finite-Lived Intangible Asset, Useful Life | 4 years |  |  |  |  |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liabilities due within one year or within 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=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, 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=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of 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=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition Amount of liabilities 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=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of 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=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of 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=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + 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=84161108&loc=d3e4845-128472 + Details
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