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Marketable Securities (Tables)
 6 Months Ended
Aug. 29, 2015
Marketable Securities [Abstract]  
Amortized cost, gross unrealized gains and losses, and estimated fair values of investments available for sale
Marketable securities available for sale at August 29, 2015 and February 28, 2015, were as follows: 
(In thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated
Fair Value
August 29, 2015
 
 
 
 
 
 
 
Mutual fund
$
30,064

 
$
—

 
$
(26
)
 
$
30,038

Municipal bonds
8,139

 
51

 
(112
)
 
8,078

Commercial paper
26,006

 
—

 
—

 
26,006

Total marketable securities
$
64,209

 
$
51

 
$
(138
)
 
$
64,122

 
 
 
 
 
 
 
 
February 28, 2015
 
 
 
 
 
 
 
Municipal bonds
$
10,973

 
$
127

 
$
(118
)
 
$
10,982

Total marketable securities
$
10,973

 
$
127

 
$
(118
)
 
$
10,982
Schedule of amortized cost and estimated fair values of investments by contractual maturity
The amortized cost and estimated fair values of municipal bonds and commercial paper at August 29, 2015, 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 Fair Value
Due within one year
$
26,090

 
$
26,091

Due after one year through five years
3,942

 
3,850

Due after five years through 10 years
4,113

 
4,143

Due after 10 years through 15 years
—

 
—

Total
$
34,145

 
$
34,084