Marketable Securities (Tables)

12 Months Ended

Dec. 27, 2015

Investments, Debt and Equity Securities [Abstract]

Marketable Debt and Equity Securities

Our marketable debt securities consisted of the following:

(In thousands)	December 27, 2015		December 28, 2014
Short-term marketable securities
U.S Treasury securities	$	184,278	$	238,488
Corporate debt securities	185,561		208,346
U.S. agency securities	65,222		32,009
Municipal securities	1,363		13,622
Certificates of deposit	60,244		109,293
Commercial paper	10,971		34,985
Total short-term marketable securities	$	507,639	$	636,743
Long-term marketable securities
Corporate debt securities	$	119,784	$	71,191
U.S. agency securities	150,583		95,204
U.S Treasury securities	20,769		—
Municipal securities	—		1,425
Total long-term marketable securities	$	291,136	$	167,820