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Marketable Securities (Tables)
 6 Months Ended
Aug. 27, 2016
Marketable Securities [Abstract]  
Amortized cost, gross unrealized gains and losses, and estimated fair values of investments available for sale
arketable securities, all classified as available for sale: 
(In thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated
Fair Value
August 27, 2016
 
 
 
 
 
 
 
Mutual fund
$
30,290

 
$
—

 
$
(55
)
 
$
30,235

Municipal bonds
12,835

 
349

 
(75
)
 
13,109

Total marketable securities
$
43,125

 
$
349

 
$
(130
)
 
$
43,344

 
 
 
 
 
 
 
 
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
Schedule of amortized cost and estimated fair values of investments by contractual maturity
The amortized cost and estimated fair values of municipal bonds at August 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 Fair Value
Due within one year
$
431

 
$
430

Due after one year through five years
4,939

 
5,013

Due after five years through 10 years
6,173

 
6,446

Due after 10 years through 15 years
1,292

 
1,220

Total
$
12,835

 
$
13,109