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Marketable Securities (Tables)

12 Months Ended

Dec. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of available for sale securities measured at estimated fair value on a recurring basis

Available-for-sale securities measured at fair value on a recurring basis are summarized below:

		Fair Value Measurements as of December 30, 2017
		Total				Level 1				Level 2				Level 3
U.S. Treasury securities		$	19,337			$	-			$	19,337			$	-
Agency securities			43,361				-				43,361				-
Mortgage-backed securities			174,615				-				174,615				-
Corporate securities			816,793				-				816,793				-
Municipal securities			186,105				-				186,105				-
Other			181,509				-				181,509				-
Total		$	1,421,720			$	-			$	1,421,720			$	-

		Fair Value Measurements as of December 31, 2016
		Total				Level 1				Level 2				Level 3
U.S. Treasury securities		$	29,034			$	-			$	29,034			$	-
Agency securities			59,541				-				59,541				-
Mortgage-backed securities			230,823				-				230,823				-
Corporate securities			893,725				-				893,725				-
Municipal securities			176,168				-				176,168				-
Other			90,946				-				90,946				-
Total		$	1,480,237			$	-			$	1,480,237			$	-

Schedule of available for sale securities

Marketable securities classified as available-for-sale securities are summarized below:

		Available-For-Sale Securities as of December 30, 2017
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
U.S. Treasury securities		$	19,591			$	-			$	(254	)		$	19,337
Agency securities			44,191				1				(831	)			43,361
Mortgage-backed securities			180,470				13				(5,868	)			174,615
Corporate securities			830,447				136				(13,790	)			816,793
Municipal securities			187,999				110				(2,004	)			186,105
Other			183,730				2				(2,223	)			181,509
Total		$	1,446,428			$	262			$	(24,970	)		$	1,421,720

		Available-For-Sale Securities as of December 31, 2016
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
U.S. Treasury securities		$	29,291			$	31			$	(288	)		$	29,034
Agency securities			60,513				19				(991	)			59,541
Mortgage-backed securities			236,354				41				(5,572	)			230,823
Corporate securities			914,028				252				(20,555	)			893,725
Municipal securities			178,804				224				(2,859	)			176,169
Other			90,934				20				(9	)			90,945
Total		$	1,509,924			$	587			$	(30,274	)		$	1,480,237

Schedule of available for sale securities unrealized loss on investments

The following tables display additional information regarding gross unrealized losses and fair value by major security type for available-for-sale securities in an unrealized loss position as of December 30, 2017 and December 31, 2016.

		As of December 30, 2017
		Less than 12 Consecutive Months								12 Consecutive Months or Longer
		Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value
U.S. Treasury securities		$	(111	)		$	12,966			$	(143	)		$	6,371
Agency securities			(168	)			16,097				(663	)			25,972
Mortgage-backed securities			(503	)			19,628				(5,365	)			153,835
Corporate securities			(4,562	)			439,174				(9,228	)			347,052
Municipal securities			(1,027	)			125,819				(977	)			38,167
Other			(2,219	)			136,147				(4	)			2,579
Total		$	(8,590	)		$	749,831			$	(16,380	)		$	573,976

		As of December 31, 2016
		Less than 12 Consecutive Months								12 Consecutive Months or Longer
		Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value
U.S. Treasury securities		$	(288	)		$	24,260			$	-			$	-
Agency securities			(991	)			49,255				-				-
Mortgage-backed securities			(3,702	)			159,665				(1,870	)			64,645
Corporate securities			(18,856	)			765,712				(1,699	)			40,910
Municipal securities			(2,762	)			130,994				(97	)			6,326
Other			(3	)			4,058				(6	)			6,919
Total		$	(26,602	)		$	1,133,944			$	(3,672	)		$	118,800

Schedule of amortized cost and estimated fair value of marketable securities by contractual maturity

The amortized cost and fair value of marketable securities at December 30, 2017, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

		Amortized Cost				Fair Value
Due in one year or less		$	162,045			$	161,687
Due after one year through five years			1,108,172				1,089,840
Due after five years through ten years			160,967				155,354
Due after ten years			15,244				14,839
		$	1,446,428			$	1,421,720

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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.

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Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

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