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Marketable Securities (Tables)
 9 Months Ended
Nov. 26, 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
November 26, 2016
 
 
 
 
 
 
 
Mutual fund
$
30,353

 
$
—

 
$
(84
)
 
$
30,269

Municipal bonds
11,419

 
50

 
(141
)
 
11,328

Total marketable securities
$
41,772

 
$
50

 
$
(225
)
 
$
41,597

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 November 26, 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
$
367

 
$
366

Due after one year through five years
4,166

 
4,164

Due after five years through 10 years
5,594

 
5,606

Due after 10 years through 15 years
1,292

 
1,192

Total
$
11,419

 
$
11,328