Marketable Securities (Tables)

3 Months Ended

Mar. 27, 2016

Investments, Debt and Equity Securities [Abstract]

Marketable Debt and Equity Securities

Our marketable debt securities consisted of the following:

(In thousands)	March 27, 2016		December 27, 2015
Short-term marketable securities
U.S Treasury securities	$	155,103	$	184,278
Corporate debt securities	163,595		185,561
U.S. agency securities	54,114		65,222
Municipal securities	—		1,363
Certificates of deposit	38,253		60,244
Commercial paper	25,332		10,971
Total short-term marketable securities	$	436,397	$	507,639
Long-term marketable securities
Corporate debt securities	$	105,406	$	119,784
U.S. agency securities	128,971		150,583
U.S Treasury securities	17,780		20,769
Total long-term marketable securities	$	252,157	$	291,136