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Pension Plans (Tables)
9 Months Ended
Jan. 26, 2013
Pension Plans [Abstract]  
Net Periodic Pension Costs
Net periodic pension costs were as follows:

   
Third Quarter Ended
  
Nine Months Ended
 
(Unaudited, amounts in thousands)
 
1/26/13
  
1/28/12
  
1/26/13
  
1/28/12
 
Service cost
 $308  $278  $924  $833 
Interest cost
  1,331   1,391   3,993   4,173 
Expected return on plan assets
  (1,714)  (1,705)  (5,142)  (5,115)
Net amortization
  756   409   2,268   1,227 
Net periodic pension cost
 $681  $373  $2,043  $1,118