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Sales by Product Line (Percentages Of Sales By Product Line) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue from External Customer [Line Items]
Total, percentage of sales	100.00%	100.00%	100.00%
Fasteners [Member]
Revenue from External Customer [Line Items]
Introduced	1967
Total, percentage of sales	36.60%	38.30%	40.20%
Tools [Member]
Revenue from External Customer [Line Items]
Introduced	1993
Total, percentage of sales	9.90%	9.50%	9.30%
Cutting tools [Member]
Revenue from External Customer [Line Items]
Introduced	1996
Total, percentage of sales	5.70%	5.60%	5.50%
Hydraulics & pneumatics [Member]
Revenue from External Customer [Line Items]
Introduced	1996
Total, percentage of sales	6.90%	7.20%	7.20%
Material handling [Member]
Revenue from External Customer [Line Items]
Introduced	1996
Total, percentage of sales	6.40%	6.50%	6.10%
Janitorial supplies [Member]
Revenue from External Customer [Line Items]
Introduced	1996
Total, percentage of sales	7.60%	7.50%	7.30%
Electrical supplies [Member]
Revenue from External Customer [Line Items]
Introduced	1997
Total, percentage of sales	4.80%	4.70%	4.70%
Welding supplies [Member]
Revenue from External Customer [Line Items]
Introduced	1997
Total, percentage of sales	4.60%	4.70%	4.70%
Safety supplies [Member]
Revenue from External Customer [Line Items]
Introduced	1999
Total, percentage of sales	14.90%	13.90%	12.80%
Metals [Member]
Revenue from External Customer [Line Items]
Introduced	2001
Total, percentage of sales	0.50%	0.50%	0.40%
Direct ship [Member]
Revenue from External Customer [Line Items]
Introduced	2004
Total, percentage of sales	0.50%	0.40%	1.00%
Office supplies [Member]
Revenue from External Customer [Line Items]
Introduced	2010
Total, percentage of sales	0.10%	0.10%	0.10%
Other product line [Member]
Revenue from External Customer [Line Items]
Total, percentage of sales	1.50%	1.10%	0.70%