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Investments | 12 Months Ended
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Sep. 27, 2019
Investments, Debt and Equity Securities [Abstract] |
Investments | . INVESTMENTS All investments are short-term in nature and are invested in corporate bonds and commercial paper, and are classified as available-for-sale. The amortized cost, gross unrealized holding gains or losses and fair value of our available-for-sale investments by major investments type as of September 27, 2019 and September 28, 2018 are summarized in the tables below (in thousands):
| September 27, 2019
| Amortized Cost | Gross Unrealized Holding Gains | Gross Unrealized Holding Losses | Aggregate Fair Value
Corporate bonds |  | $ | 29,578 |  |  | $ | 112 |  |  | $ | (93 | ) |  | $ | 29,597 |
Commercial paper |  | 71,646 |  |  | 1 |  |  | (18 | ) |  | 71,629 |
Total investments |  | $ | 101,224 |  |  | $ | 113 |  |  | $ | (111 | ) |  | $ | 101,226 |
| September 28, 2018
| Amortized Cost | Gross Unrealized Holding Gains | Gross Unrealized Holding Losses | Aggregate Fair Value
Corporate bonds |  | $ | 28,731 |  |  | $ | — |  |  | $ | (460 | ) |  | $ | 28,271 |
Commercial paper |  | 69,966 |  |  | — |  |  | (16 | ) |  | 69,950 |
Total investments |  | $ | 98,697 |  |  | $ | — |  |  | $ | (476 | ) |  | $ | 98,221 |
The contractual maturities of available-for-sale investments were as follows (in thousands):
| September 27, 2019
Less than 1 year | $ | 75,233 |
Over 1 year | 25,993 |
Total investments | $ | 101,226 |
Available-for-sale investments are reported at fair value and as such, their associated unrealized gains and losses are reported as a separate component of stockholders’ equity within accumulated other comprehensive income (loss). We have determined that the gross unrealized losses on available for sale securities at September 27, 2019 and September 28, 2018 are temporary in nature. We review our investments to identify and evaluate investments that have indications of possible impairment. The techniques used to measure the fair value of our investments are described in Note 6 - Fair Value. Factors considered in determining whether a loss is temporary include the length of time and extent to which fair value has been less than the cost basis, the financial condition and near-term prospects of the investee, and our intent and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value. Substantially all of our fixed income securities are rated investment grade or better. We received proceeds from sales of available-for-sale securities of $173.0 million and $100.4 million during the fiscal years 2019 and 2018, respectively. Such sales resulted in gross realized gains of $0.2 million and less than $0.1 million and gross realized losses of $0.2 million and $0.3 million during the fiscal years ended September 27, 2019 and September 28, 2018, respectively, which have been recorded within other expense. Other Investments— As of September 27, 2019 and September 28, 2018 we held two no n-marketable equity investments classified as other long-term investments. One of these is a minority investment in a preferred stock ownership of a privately held manufacturing corporation with preferred liquidation rights over other equity shares. This investment had a value of $5.0 million at the date of purchase and approximates the then current fair value. Since we do not have the ability to exercise significant influence or control over the investee we account for this investment at cost, which we evaluate for impairment at each balance sheet date and through September 27, 2019 no impairment has been recorded for this investment. In addition, we have a minority investment of less than 20.0% of the outstanding equity of a privately held limited liability corporation ("Compute"). This investment was acquired in conjunction with the divestiture of the Compute business during the fiscal quarter ended December 29, 2017, had an initial value of $36.5 million and is accounted for using the equity method. We have no obligation to provide further funding to Compute. This investment value is updated quarterly based on our proportionate share of the losses or earnings of Compute, as well as any changes in Compute's equity, utilizing the equity method. During fiscal years 2019 and 2018, we recorded $7.5 million and $10.4 million of losses associated with this investment as other expense in our Consolidated Statements of Operations. The carrying value of this investment was $18.6 million and $26.1 million as of September 27, 2019 and September 28, 2018, respectively.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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