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Business Segments - Additional Information (Detail) (USD $)
In Millions
3 Months Ended9 Months Ended
Oct. 01, 2011
Oct. 02, 2010
Oct. 01, 2011
Oct. 02, 2010
Segment Reporting Information [Line Items]    
Net sales recast from CDIY to the Industrial segment$ 2,636.4$ 2,369.1$ 7,640.3$ 5,996.7
Segment profit recast from CDIY to the Industrial segment385.2326.71,111.8713.2
Inventory step-up amortization recorded in cost of sales 10.0  
Corporate overhead costs18.77.550.172.2
The Black & Decker Corporation
    
Segment Reporting Information [Line Items]    
Inventory step-up amortization recorded in cost of sales 20.0 185.3
Industrial Segment | Additional | Selling, General and Administrative Expense
    
Segment Reporting Information [Line Items]    
AdditionalIntegration costs associated with the Merger 0.4 0.4
Intersegment Elimination
    
Segment Reporting Information [Line Items]    
Net sales recast from CDIY to the Industrial segment (23.0) (57.0)
Segment profit recast from CDIY to the Industrial segment (5.0) (15.0)
Construction and Do It Yourself
    
Segment Reporting Information [Line Items]    
Decrease in segment profit due to non-cash inventory step-up amortization6.65.813.2126.1
Securities Industry
    
Segment Reporting Information [Line Items]    
Decrease in segment profit due to non-cash inventory step-up amortization11.39.817.836.8
Industrial Segment
    
Segment Reporting Information [Line Items]    
Decrease in segment profit due to non-cash inventory step-up amortization0.54.80.822.8
Cost of Sales
    
Segment Reporting Information [Line Items]    
Facility closure costs13.9 25.2 
Selling, General and Administrative Expense
    
Segment Reporting Information [Line Items]    
AdditionalIntegration costs associated with the Merger$ 4.5 $ 6.7