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Sales by Product Line (Percentages Of Net Sales By Product Line) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Total, percentage of net sales	100.00%	100.00%	100.00%
Fasteners [Member]
Revenue from External Customer [Line Items]
Introduced	1967
Total, percentage of net sales	38.30%	40.20%	42.10%
Tools [Member]
Revenue from External Customer [Line Items]
Introduced	1993
Total, percentage of net sales	9.50%	9.30%	9.20%
Cutting tools [Member]
Revenue from External Customer [Line Items]
Introduced	1996
Total, percentage of net sales	5.60%	5.50%	5.40%
Hydraulics & pneumatics [Member]
Revenue from External Customer [Line Items]
Introduced	1996
Total, percentage of net sales	7.20%	7.20%	7.30%
Material handling [Member]
Revenue from External Customer [Line Items]
Introduced	1996
Total, percentage of net sales	6.50%	6.10%	5.70%
Janitorial supplies [Member]
Revenue from External Customer [Line Items]
Introduced	1996
Total, percentage of net sales	7.50%	7.30%	7.00%
Electrical supplies [Member]
Revenue from External Customer [Line Items]
Introduced	1997
Total, percentage of net sales	4.70%	4.70%	4.60%
Welding supplies [Member]
Revenue from External Customer [Line Items]
Introduced	1997
Total, percentage of net sales	4.70%	4.70%	4.50%
Safety supplies [Member]
Revenue from External Customer [Line Items]
Introduced	1999
Total, percentage of net sales	13.90%	12.80%	11.20%
Metals [Member]
Revenue from External Customer [Line Items]
Introduced	2001
Total, percentage of net sales	0.50%	0.40%	0.50%
Direct ship [Member]
Revenue from External Customer [Line Items]
Introduced	2004
Total, percentage of net sales	0.40%	1.00%	1.50%
Office supplies [Member]
Revenue from External Customer [Line Items]
Introduced	2010
Total, percentage of net sales	0.10%	0.10%	0.10%
Other product line [Member]
Revenue from External Customer [Line Items]
Total, percentage of net sales	1.10%	0.70%	0.90%