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Investments: (Tables)

12 Months Ended

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)

X

- 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

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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-Topic 320
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-Section 50
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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

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