Marketable Securities (Tables)

6 Months Ended

Jun. 25, 2017

Investments, Debt and Equity Securities [Abstract]

Marketable Debt and Equity Securities

Our marketable debt securities consisted of the following:

(In thousands)	June 25, 2017		December 25, 2016
Short-term marketable securities
U.S Treasury securities	$	111,222	$	150,623
Corporate debt securities	178,869		150,599
U.S. governmental agency securities	50,488		64,135
Certificates of deposit	11,102		—
Commercial paper	30,888		84,178
Total short-term marketable securities	$	382,569	$	449,535
Long-term marketable securities
U.S. governmental agency securities	$	107,692	$	110,732
Corporate debt securities	64,076		61,775
U.S Treasury securities	48,940		14,792
Total long-term marketable securities	$	220,708	$	187,299