Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jul. 02, 2011	Jul. 02, 2011	Jan. 01, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized	$ 21.1	$ 34.4
Restructuring reserves utilized to date		42.6
Restructuring reserve	96.0	96.0	101.2
2011 Actions
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized		32.2
Severance and related charges	1.2	2.7
Restructuring reserves utilized to date		7.8
Number of employees reduced due to restructuring	66	83
Restructuring reserve	25.1	25.1
Facility closure costs		0.2
2011 Actions | Black Decker Merger and Acquisition of Stanley Solutions De Securite
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized	19.7	29.3
Severance and related charges	18.9	26.5
Number of employees reduced due to restructuring	358	633
Facility closure costs	0.3	1.8
Other charges	0.5	1.0
Pre-2011 Actions
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized		2.2
Restructuring reserves utilized to date		34.8
Restructuring reserve	70.9	70.9	101.2
Pre-2011 Actions | Black Decker Merger and Acquisition of Stanley Solutions De Securite
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized		2.8
Restructuring Action Initiated In 2010
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized	0.2	0.6
The Black & Decker Corporation
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized		11.1
Construction and Do It Yourself
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized	8.2	14.5
Securities Industry
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized	12.5	14.0
Industrial Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges recognized	$ 0.4	$ 5.9