Marketable Securities (Tables)

12 Months Ended

Dec. 25, 2016

Investments, Debt and Equity Securities [Abstract]

Marketable Debt and Equity Securities

Our marketable debt securities consisted of the following:

(In thousands)	December 25, 2016		December 27, 2015
Short-term marketable securities
U.S Treasury securities	$	150,623	$	184,278
Corporate debt securities	150,599		185,561
U.S. governmental agency securities	64,135		65,222
Municipal securities	—		1,363
Certificates of deposit	—		60,244
Commercial paper	84,178		10,971
Total short-term marketable securities	$	449,535	$	507,639
Long-term marketable securities
U.S. governmental agency securities	$	110,732	$	150,583
Corporate debt securities	61,775		119,784
U.S Treasury securities	14,792		20,769
Total long-term marketable securities	$	187,299	$	291,136