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Property and Equipment | 6 Months Ended | 12 Months Ended
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Mar. 26, 2022 | Sep. 25, 2021
Property, Plant and Equipment [Abstract] |  |
Property and Equipment | 5. Property and Equipment Property and equipment at March 26, 2022 and September 25, 2021 consists of the following (in thousands):
|  | March 26, 2022 |  |  | September 25, 2021 |
Computer equipment and software, furniture and fixtures, and test equipment |  | $ | 37,427 |  |  | $ | 34,268 |
Leasehold improvements |  |  | 2,919 |  |  |  | 2,909 |
Total property and equipment |  |  | 40,346 |  |  |  | 37,177 |
Less accumulated depreciation |  |  | (21,145 | ) |  |  | (18,560 | )
Property and equipment, net |  | $ | 19,201 |  |  | $ | 18,617 |
Depreciation expense was $1.3 million for the three months ended March 26, 2022, $2.5 million for the six months ended March 26, 2022, $0.8 million for the three months ended March 27, 2021, and $1.6 million for the six months ended March 27, 2021. | 6. Property and Equipment Property and equipment at September 25, 2021 and September 26, 2020 consists of the following (in thousands):
|  | Year Ended |
|  | September 25, 2021 |  |  | September 26, 2020 |
Computer equipment and software, furniture and fixtures, and test equipment |  | $ | 34,268 |  |  | $ | 33,276 |
Leasehold improvements |  |  | 2,909 |  |  |  | 2,725 |
Total property and equipment |  |  | 37,177 |  |  |  | 36,001 |
Less accumulated depreciation |  |  | (18,560 | ) |  |  | (26,815 | )
Property and equipment, net |  | $ | 18,617 |  |  | $ | 9,186 |
Depreciation expense was $4.0 million for the year ended September 25, 2021, $5.3 million for the year ended September 26, 2020, and $6.9 million for the year ended September 28, 2019.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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