Marketable Securities (Tables)

9 Months Ended

Sep. 25, 2016

Investments, Debt and Equity Securities [Abstract]

Marketable Debt and Equity Securities

Our marketable debt securities consisted of the following:

(In thousands)	September 25, 2016		December 27, 2015
Short-term marketable securities
U.S Treasury securities	$	220,194	$	184,278
Corporate debt securities	159,846		185,561
U.S. governmental agency securities	88,722		65,222
Municipal securities	—		1,363
Certificates of deposit	21,301		60,244
Commercial paper	99,002		10,971
Total short-term marketable securities	$	589,065	$	507,639
Long-term marketable securities
U.S. governmental agency securities	$	111,254	$	150,583
Corporate debt securities	72,817		119,784
U.S Treasury securities	14,790		20,769
Total long-term marketable securities	$	198,861	$	291,136