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MARKETABLE SECURITIES | 3 Months Ended
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Mar. 28, 2014
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | MARKETABLE SECURITIES Marketable securities consist of CDs, VRDNs, corporate debt securities, municipal debt securities, and commercial paper, which are classified as available-for-sale. The following tables present the amortized cost and fair value of our marketable securities, which are carried at fair value (in millions):
| March 28, 2014
| Amortized Cost |  | Fair Value
Certificates of deposit | $ | 9.5 |  |  | $ | 9.5 |
Variable-rate demand notes | 1.8 |  |  | 1.8 |
Commercial paper | 5.0 |  |  | 5.0 |
Municipal debt securities | 10.4 |  |  | 10.4 |
Corporate debt securities | 9.6 |  |  | 9.6 |
| $ | 36.3 |  |  | $ | 36.3 |
| December 27, 2013
| Amortized Cost |  | Fair Value
Certificates of deposit | $ | 10.0 |  |  | $ | 9.9 |
Variable-rate demand notes | 5.8 |  |  | 5.8 |
Commercial paper | 5.0 |  |  | 5.0 |
| $ | 20.8 |  |  | $ | 20.7 |
Gross unrealized gains and loss were de minimis for the thirteen weeks ended March 28, 2014. We held no marketable securities during the thirteen weeks ended March 29, 2013. Our marketable securities have not resulted in any other-than-temporary impairments for the thirteen weeks ended March 28, 2014. The amortized cost and fair value by contractual maturity of our marketable securities are as follows (in millions):
| March 28, 2014
| Amortized Cost |  | Fair Value
Due in one year or less (1) | $ | 31.8 |  |  | $ | 31.8 |
Due after one year (2) | 4.5 |  |  | 4.5 |
| $ | 36.3 |  |  | $ | 36.3 |
(1) | Amounts due in one year or less include CDs, corporate debt securities, municipal debt securities, commercial paper, and a VRDN. As of March 28, 2014, the VRDN had a contractual maturity date greater than 18 years. Although this security is issued as long-term, it is priced and traded as short-term because of the high liquidity provided through the tender feature. It is not our intent to hold to maturity.
(2) | Amounts due after one year include CDs with maturities within two years and are recorded in Other assets on the Consolidated Balance Sheets.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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