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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