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Marketable Securities (Tables)
 3 Months Ended
May. 30, 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 May 30, 2015 and February 28, 2015, were as follows: 
(In thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated
Fair Value
May 30, 2015
 
 
 
 
 
 
 
Mutual fund
$
30,011

 
$
—

 
$
(13
)
 
$
29,998

Municipal bonds
$
10,060

 
$
71

 
$
(147
)
 
$
9,984

Commercial paper
$
5,000

 
$
—

 
$
—

 
$
5,000

Total available for sale securities
$
45,071

 
$
71

 
$
(160
)
 
$
44,982

 
 
 
 
 
 
 
 
February 28, 2015
 
 
 
 
 
 
 
Municipal bonds
$
10,973

 
$
127

 
$
(118
)
 
$
10,982

Total available for sale 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 investments at May 30, 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
$
5,277

 
$
5,281

Due after one year through five years
2,816

 
2,816

Due after five years through 10 years
5,717

 
5,749

Due after 10 years through 15 years
1,250

 
1,138

Total
$
15,060

 
$
14,984