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Quarterly Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Quarterly operating data (unaudited)
 
Fiscal 2018
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Sales
$
2,282,681

 
$
2,456,073

 
$
2,482,717

 
$
2,314,957

Gross profit
1,201,258

 
1,288,638

 
1,315,755

 
1,234,315

Operating income
422,846

 
479,150

 
485,148

 
428,040

Net income
304,906

 
353,073

 
366,151

 
300,357

Earnings per share – basic (1)
$
3.65

 
$
4.32

 
$
4.54

 
$
3.76

Earnings per share – assuming dilution (1)
$
3.61

 
$
4.28

 
$
4.50

 
$
3.72


 
Fiscal 2017
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Sales
$
2,156,259

 
$
2,290,829

 
$
2,339,830

 
$
2,190,808

Gross profit
1,131,147

 
1,200,062

 
1,230,294

 
1,159,180

Operating income
403,157

 
457,445

 
461,963

 
402,835

Net income
264,934

 
282,821

 
283,734

 
302,315

Earnings per share – basic (1)
$
2.88

 
$
3.14

 
$
3.26

 
$
3.56

Earnings per share – assuming dilution (1)
$
2.83

 
$
3.10

 
$
3.22

 
$
3.52


(1) 
Earnings per share amounts are computed independently for each quarter and annual period. The quarterly earnings per share amounts may not sum to equal the full-year earnings per share amount.