Cash, Cash Equivalents and Short-Term Investments (Tables)

12 Months Ended

Dec. 01, 2017

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Cash, Cash Equivalents and Short-term Investments

Cash, cash equivalents and short-term investments consisted of the following as of December 1, 2017 (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Current assets:
Cash	$	280,488	$	—	$	—		$	280,488
Cash equivalents:
Money market mutual funds	2,006,741		—		—			2,006,741
Time deposits	18,843		—		—			18,843
Total cash equivalents	2,025,584		—		—			2,025,584
Total cash and cash equivalents	2,306,072		—		—			2,306,072
Short-term fixed income securities:
Asset-backed securities	98,403		1		(403		)	98,001
Corporate bonds and commercial paper	2,461,691		2,694		(10,125		)	2,454,260
Foreign government securities	2,396		—		(8		)	2,388
Municipal securities	21,189		8		(132		)	21,065
U.S. Treasury securities	941,538		2		(3,552		)	937,988
Total short-term investments	3,525,217		2,705		(14,220		)	3,513,702
Total cash, cash equivalents and short-term investments	$	5,831,289	$	2,705	$	(14,220	)	$	5,819,774

Cash, cash equivalents and short-term investments consisted of the following as of December 2, 2016 (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Current assets:
Cash	$	208,635	$	—	$	—		$	208,635
Cash equivalents:
Corporate bonds and commercial paper	1,249		—		—			1,249
Money market mutual funds	782,210		—		—			782,210
Municipal securities	1,301		—		—			1,301
Time deposits	17,920		—		—			17,920
Total cash equivalents	802,680		—		—			802,680
Total cash and cash equivalents	1,011,315		—		—			1,011,315
Short-term fixed income securities:
Asset backed securities	111,009		95		(190		)	110,914
Corporate bonds and commercial paper	2,464,769		3,135		(9,554		)	2,458,350
Municipal securities	134,710		37		(525		)	134,222
U.S. agency securities	39,538		42		—			39,580
U.S. Treasury securities	1,008,195		194		(1,470		)	1,006,919
Total short-term investments	3,758,221		3,503		(11,739		)	3,749,985
Total cash, cash equivalents and short-term investments	$	4,769,536	$	3,503	$	(11,739	)	$	4,761,300

Continuous Unrealized Loss Position Less Than Twelve Months Related to Available-for-Sale Securities

The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category, that have been in an unrealized loss position for less than twelve months, as of December 1, 2017 and December 2, 2016 (in thousands):

	2017					2016
	Fair  Value		Gross Unrealized Losses			Fair  Value		Gross Unrealized Losses
Corporate bonds and commercial paper	$	1,338,232	$	(5,459	)	$	1,282,076	$	(9,474	)
Asset-backed securities	64,618		(193		)	54,063		(189		)
Municipal securities	11,805		(115		)	114,810		(525		)
Foreign government securities	2,388		(8		)	—		—
U.S. Treasury and agency securities	593,296		(2,087		)	580,529		(1,470		)
Total	$	2,010,339	$	(7,862	)	$	2,031,478	$	(11,658	)

Continuous Unrealized Loss Position Twelve Months or Longer Related to Available-for-Sale-Securities

The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category, that were in a continuous unrealized loss position for more than twelve months, as of December 1, 2017 and December 2, 2016 (in thousands):

	2017					2016
	Fair  Value		Gross Unrealized Losses			Fair  Value		Gross Unrealized Losses
Corporate bonds and commercial paper	$	500,689	$	(4,666	)	$	39,162	$	(80	)
Asset-backed security	32,383		(210		)	1,331		(1		)
Municipal securities	598		(17		)	—		—
U.S. Treasury securities	338,950		(1,465		)	—		—
Total	$	872,620	$	(6,358	)	$	40,493	$	(81	)

Cost and Estimated Fair Value of Debt Securities

The following table summarizes the cost and estimated fair value of short-term fixed income securities classified as short-term investments based on stated effective maturities as of December 1, 2017 (in thousands):

	Amortized Cost		Estimated Fair Value
Due within one year	$	1,025,894	$	1,023,639
Due between one and two years	1,294,919		1,289,307
Due between two and three years	815,254		812,828
Due after three years	389,150		387,928
Total	$	3,525,217	$	3,513,702