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Marketable Securities | 6 Months Ended
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Mar. 26, 2016
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities The following reconciles the cost basis to the fair market value of the Company’s equity securities that are classified as available-for-sale:
Period Ended: | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Other Than Temporary Impairment |  | Fair Value
Six Months Ended March 26, 2016 | $ | 2.4 |  |  | $ | — |  |  | $ | (1.5 | ) |  | $ | — |  |  | $ | 0.9 |
Year Ended September 26, 2015 | $ | 16.1 |  |  | $ | 7.2 |  |  | $ | (0.3 | ) |  | $ | (7.8 | ) |  | $ | 15.2 |
In the first quarter of fiscal 2016, the Company sold all of its shares in one of its marketable securities and recorded a realized gain of $25.1 million in Other income (expense), net. In the fourth quarter of fiscal 2015, the Company concluded that the decline in fair value of one of its marketable securities was other-than-temporary based on the length of time the security's market value was significantly below its carrying value and recorded an impairment charge of $7.8 million.

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