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Note I - Income Taxes (Tables)
12 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Fiscal year ended
 
 
 
 
 
 
 
 
   
September 30,
   
September 24,
   
September 26,
 
   
2017
   
2016
   
2015
 
   
(in thousands)
 
Current
                       
U.S. Federal
  $
27,142
    $
25,126
    $
33,348
 
Foreign
   
2,770
     
2,433
     
2,260
 
State
   
5,227
     
5,622
     
6,294
 
Total current expense
   
35,139
     
33,181
     
41,902
 
                         
Deferred
                       
U.S. Federal
  $
6,857
    $
6,444
    $
(109
)
Foreign
   
(422
)    
(145
)    
(34
)
State
   
1,452
     
1,364
     
(23
)
Total deferred expense(benefit)
   
7,887
     
7,663
     
(166
)
Total expense
  $
43,026
    $
40,844
    $
41,736
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Fiscal year ended
 
   
September 30,
   
September 24,
   
September 26,
 
   
2017
   
2016
   
2015
 
   
(in thousands)
 
                         
Income taxes at federal statutory rates
  $
42,770
    $
40,887
    $
39,172
 
Increase (decrease)in taxes resulting from:
                       
                         
State income taxes, net of federal income tax benefit
   
4,341
     
4,541
     
4,196
 
Domestic production activities deduction
   
(1,820
)    
(2,100
)    
(2,100
)
Increase in gross unrecognized tax benefits
   
20
     
20
     
39
 
(Decrease) increase in federal valuation allowance
   
(6
)    
240
     
1,366
 
Share based compensation
   
(1,923
)    
(1,109
)    
308
 
Other, net
   
(356
)    
(1,635
)    
(1,245
)
Income tax expense
  $
43,026
    $
40,844
    $
41,736
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   
September 30,
   
September 24,
 
   
2017
   
2016
 
   
(in thousands)
 
Deferred tax assets
               
Vacation accrual
  $
1,740
    $
1,646
 
Capital loss carry forwards
   
1,668
     
1,674
 
Insurance accrual
   
3,225
     
3,317
 
Deferred income
   
927
     
112
 
Allowances
   
1,991
     
1,514
 
Inventory capitalization
   
1,235
     
954
 
Share-based compensation
   
1,607
     
1,253
 
Net Operating Loss
   
1,559
     
1,691
 
Total deferred tax assets
   
13,952
     
12,161
 
Valuation allowance
   
(1,668
)    
(1,674
)
Total deferred tax assets, net
   
12,284
     
10,487
 
                 
Deferred tax liabilities
               
Amortization of goodwill
and other intangible
assets
   
35,043
     
27,358
 
Depreciation of property
and equipment
   
39,946
     
31,315
 
Total deferred tax liabilities
   
74,989
     
58,673
 
Total deferred tax liabilities, net
  $
62,705
    $
48,186