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Investments: (Tables) | 12 Months Ended
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Dec. 30, 2017
Investments: |
Summary of marketable securities classified as available-for-sale securities |
|  | December 30, 2017 |  | December 31, 2016 |
|  | Cost |  | Fair Value |  | Cost |  | Fair Value |
Equity securities |  | $ | — |  | $ | — |  | $ | 215,800 |  | $ | 199,900 |
Schedule of the Company's unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive loss |
|  | Year Ended |
|  | December 30, 2017 |  | December 31, 2016 |  | December 26, 2015 |
Unrealized gains |  | $ | — |  | $ | — |  | $ | — |
Unrealized losses |  |  | — |  |  | (15,900) |  |  | (52,800) |
Net unrealized losses |  | $ | — |  | $ | (15,900) |  | $ | (52,800) |
Schedule of the Company's realized gains and losses recognized on sales of available-for-sale marketable securities |
|  | Year Ended |
|  | December 30, 2017 |  | December 31, 2016 |  | December 26, 2015 |
Realized gains |  | $ | 10,300 |  | $ | — |  | $ | 13,400 |
Realized losses |  |  | (8,900) |  |  | (12,600) |  |  | (36,200) |
Net realized gains (losses) |  | $ | 1,400 |  | $ | (12,600) |  | $ | (22,800) |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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