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Marketable Securities | 12 Months Ended
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Feb. 27, 2016
Marketable Securities [Abstract] |
Marketable Securities | Marketable Securities We hold the following marketable securities, all classified as available for sale:
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
February 27, 2016 |  |  |  |  |  |  |
Mutual fund | $ | 30,178 |  |  | $ | — |  |  | $ | (55 | ) |  | $ | 30,123 |
Municipal bonds | 12,393 |  |  | 285 |  |  | (109 | ) |  | 12,569 |
Total marketable securities | $ | 42,571 |  |  | $ | 285 |  |  | $ | (164 | ) |  | $ | 42,692 |
February 28, 2015 |  |  |  |  |  |  |
Municipal bonds | $ | 10,973 |  |  | $ | 127 |  |  | $ | (118 | ) |  | $ | 10,982 |
Total marketable securities | $ | 10,973 |  |  | $ | 127 |  |  | $ | (118 | ) |  | $ | 10,982 |
We are invested in a mutual fund holding short-term government securities as a means of deploying excess cash generated from operations while preserving liquidity. We have a wholly-owned insurance subsidiary, Prism Assurance, Ltd. (Prism), which holds our municipal bonds. Prism insures a portion of our general liability, workers' compensation and automobile liability risks using reinsurance agreements to meet statutory requirements. The reinsurance carrier requires Prism to maintain fixed-maturity investments, which are generally high-quality municipal bonds, for the purpose of providing collateral for Prism's obligations under the reinsurance agreement. We test for other-than-temporary losses on a quarterly basis and whenever events or changes in circumstances indicate that the carrying amount of an investment may not be recoverable. We consider the unrealized losses indicated above to be temporary in nature. We intend to hold our investments until the full principal amount can be recovered, and we have the ability to do so based on other sources of liquidity. The following table presents the length of time that our securities were in continuous unrealized loss positions, but were not deemed to be other than temporarily impaired, as of February 27, 2016:
| Less Than 12 Months |  | Greater Than or Equal to 12 Months |  | Total
(In thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Municipal bonds | $ | — |  |  | $ | — |  |  | $ | 1,345 |  |  | $ | (109 | ) |  | $ | 1,345 |  |  | $ | (109 | )
The amortized cost and estimated fair values of our municipal bonds at February 27, 2016, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities, as borrowers may have the right to call or prepay obligations with or without penalty.
(In thousands) | Amortized Cost |  | Estimated Market Value
Due within one year | $ | 50 |  |  | $ | 50 |
Due after one year through five years | 3,853 |  |  | 3,903 |
Due after five years through 10 years | 7,198 |  |  | 7,428 |
Due after 10 years through 15 years | 1,292 |  |  | 1,188 |
Total | $ | 12,393 |  |  | $ | 12,569 |
Gross realized gains and losses were insignificant for all periods presented and are included in other income (expense), net in our consolidated results of operations.

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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 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: 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 3: 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 4: 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 5: 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 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 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 9: 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 + Details
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