Fair Value Measurements (Details) - USD ($) $ in Thousands	Nov. 28, 2015	Feb. 28, 2015
Cash equivalents
Available-for-sale Securities, Current	$ 60,653
Total assets at fair value	90,068	$ 45,673
Money market funds [Member]
Cash equivalents
Total cash equivalents		34,386
Quoted Prices in Active Markets (Level 1) [Member]
Cash equivalents
Available-for-sale Securities, Current	30,051
Total assets at fair value	48,444	34,691
Quoted Prices in Active Markets (Level 1) [Member] \| Money market funds [Member]
Cash equivalents
Total cash equivalents		34,386
Other Observable Inputs (Level 2) [Member]
Cash equivalents
Available-for-sale Securities, Current	30,602
Total assets at fair value	41,624	10,982
Other Observable Inputs (Level 2) [Member] \| Money market funds [Member]
Cash equivalents
Total cash equivalents		0
Mutual funds [Member]
Cash equivalents
Available-for-sale Securities, Current	30,051
Available-for-sale Securities, Noncurrent		305
Mutual funds [Member] \| Quoted Prices in Active Markets (Level 1) [Member]
Cash equivalents
Available-for-sale Securities, Current	30,051
Available-for-sale Securities, Noncurrent		305
Mutual funds [Member] \| Other Observable Inputs (Level 2) [Member]
Cash equivalents
Available-for-sale Securities, Current	0
Available-for-sale Securities, Noncurrent		0
Money market funds [Member]
Cash equivalents
Total cash equivalents	18,393
Money market funds [Member] \| Quoted Prices in Active Markets (Level 1) [Member]
Cash equivalents
Total cash equivalents	18,393
Money market funds [Member] \| Other Observable Inputs (Level 2) [Member]
Cash equivalents
Total cash equivalents	0
Commercial Paper [Member]
Cash equivalents
Available-for-sale Securities, Current	30,517
Commercial Paper [Member] \| Quoted Prices in Active Markets (Level 1) [Member]
Cash equivalents
Available-for-sale Securities, Current	0
Commercial Paper [Member] \| Other Observable Inputs (Level 2) [Member]
Cash equivalents
Available-for-sale Securities, Current	30,517
Municipal bonds [Member]
Cash equivalents
Available-for-sale Securities, Current	85	327
Available-for-sale Securities, Noncurrent	11,022	10,655
Municipal bonds [Member] \| Quoted Prices in Active Markets (Level 1) [Member]
Cash equivalents
Available-for-sale Securities, Current	0	0
Available-for-sale Securities, Noncurrent	0	0
Municipal bonds [Member] \| Other Observable Inputs (Level 2) [Member]
Cash equivalents
Available-for-sale Securities, Current	85	327
Available-for-sale Securities, Noncurrent	$ 11,022	$ 10,655

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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