Condensed Consolidating Statements of Cash Flow (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Dec. 31, 2011
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Cash (used in) provided by operating activities	$ (147.5)	$ (32.3)
INVESTING ACTIVITIES
Capital expenditures	(79.5)	(61.5)
Business acquisitions, net of cash acquired	(853.9)	(114.7)
Proceeds from sale of assets	1.0	1.9
Intercompany payables and receivables	0	0
Proceeds (payments) on net investment hedge settlements	(9.2)	2.0
Cash provided by (used in) investing activities	(941.6)	(172.3)
FINANCING ACTIVITIES
Payments on long-term debt	(0.6)	(0.3)
Stock purchase contract fees	(0.8)	(0.8)
Net short-term borrowings (repayments)	1,330.5	196.8
Cash dividends on common stock	(79.1)	(69.9)
Payments for Repurchase of Equity	(350.0)	0	(350.0)
Termination of interest rate swaps	0	35.8
Termination of forward starting interest rate swap	0	(56.4)
Proceeds from the issuance of common stock	83.2	64.6
Purchase of common stock for treasury	(21.1)	(10.9)
Intercompany payables and receivables	0	0
Cash provided by (used in) financing activities	962.1	158.9
Effect of exchange rate changes on cash and cash equivalents	(31.5)	22.4
Change in cash and cash equivalents	(158.5)	(23.3)
Cash and cash equivalents, beginning of period	716.0	906.9
CASH AND CASH EQUIVALENTS, END OF PERIOD	557.5	883.6	906.9
Parent Stanley Black & Decker, Inc.
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Cash (used in) provided by operating activities	(498.5)	(267.9)
INVESTING ACTIVITIES
Capital expenditures	(9.4)	(10.3)
Business acquisitions, net of cash acquired	0
Proceeds from sale of assets	0	0.9
Intercompany payables and receivables	(877.7)	175.4
Proceeds (payments) on net investment hedge settlements	(9.2)	0
Cash provided by (used in) investing activities	(896.3)	72.2
FINANCING ACTIVITIES
Payments on long-term debt	(0.3)	(0.3)
Stock purchase contract fees	(0.8)	(0.8)
Net short-term borrowings (repayments)	1,330.4	196.9
Cash dividends on common stock	(79.1)	(69.9)
Payments for Repurchase of Equity	0
Termination of interest rate swaps		15.2
Termination of forward starting interest rate swap		(56.4)
Proceeds from the issuance of common stock	83.2	64.6
Purchase of common stock for treasury	(21.1)	(10.9)
Intercompany payables and receivables	0	0
Cash provided by (used in) financing activities	1,312.3	138.4
Effect of exchange rate changes on cash and cash equivalents	0	0
Change in cash and cash equivalents	(82.5)	(57.3)
Cash and cash equivalents, beginning of period	83.5	56.2
CASH AND CASH EQUIVALENTS, END OF PERIOD	1.0	(1.1)
The Black & Decker Corporation
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Cash (used in) provided by operating activities	(1.7)	(27.9)
INVESTING ACTIVITIES
Capital expenditures	0	0
Business acquisitions, net of cash acquired	0
Proceeds from sale of assets	0	0
Intercompany payables and receivables	(27.8)	185.0
Proceeds (payments) on net investment hedge settlements	0	2.0
Cash provided by (used in) investing activities	(27.8)	187.0
FINANCING ACTIVITIES
Payments on long-term debt	0	0
Stock purchase contract fees	0	0
Net short-term borrowings (repayments)	0	0
Cash dividends on common stock	0	0
Payments for Repurchase of Equity	0
Termination of interest rate swaps		20.6
Termination of forward starting interest rate swap		0
Proceeds from the issuance of common stock	0	0
Purchase of common stock for treasury	0	0
Intercompany payables and receivables	28.3	(161.4)
Cash provided by (used in) financing activities	28.3	(140.8)
Effect of exchange rate changes on cash and cash equivalents	0	0
Change in cash and cash equivalents	(1.2)	18.3
Cash and cash equivalents, beginning of period	1.5	1.4
CASH AND CASH EQUIVALENTS, END OF PERIOD	0.3	19.7
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Cash (used in) provided by operating activities	352.7	263.5
INVESTING ACTIVITIES
Capital expenditures	(70.1)	(51.2)
Business acquisitions, net of cash acquired	(853.9)
Proceeds from sale of assets	1.0	1.0
Intercompany payables and receivables	0	0
Proceeds (payments) on net investment hedge settlements	0	0
Cash provided by (used in) investing activities	(923.0)	(71.1)
FINANCING ACTIVITIES
Payments on long-term debt	(0.3)	0
Stock purchase contract fees	0	0
Net short-term borrowings (repayments)	0.1	(0.1)
Cash dividends on common stock	0	0
Payments for Repurchase of Equity	(350.0)
Termination of interest rate swaps		0
Termination of forward starting interest rate swap		0
Proceeds from the issuance of common stock	0	0
Purchase of common stock for treasury	0	0
Intercompany payables and receivables	877.2	(199.0)
Cash provided by (used in) financing activities	527.0	(199.1)
Effect of exchange rate changes on cash and cash equivalents	(31.5)	22.4
Change in cash and cash equivalents	(74.8)	15.7
Cash and cash equivalents, beginning of period	631.0	849.3
CASH AND CASH EQUIVALENTS, END OF PERIOD	556.2	865.0
Eliminations
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Cash (used in) provided by operating activities	0	0
INVESTING ACTIVITIES
Capital expenditures	0	0
Business acquisitions, net of cash acquired	0
Proceeds from sale of assets	0	0
Intercompany payables and receivables	905.5	(360.4)
Proceeds (payments) on net investment hedge settlements	0	0
Cash provided by (used in) investing activities	905.5	(360.4)
FINANCING ACTIVITIES
Payments on long-term debt	0	0
Stock purchase contract fees	0	0
Net short-term borrowings (repayments)	0	0
Cash dividends on common stock	0	0
Payments for Repurchase of Equity	0
Termination of interest rate swaps		0
Termination of forward starting interest rate swap		0
Proceeds from the issuance of common stock	0	0
Purchase of common stock for treasury	0	0
Intercompany payables and receivables	(905.5)	360.4
Cash provided by (used in) financing activities	(905.5)	360.4
Effect of exchange rate changes on cash and cash equivalents	0	0
Change in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	0	0
Niscayah [Member]
INVESTING ACTIVITIES
Business acquisitions, net of cash acquired		(114.7)
Niscayah [Member] | Parent Stanley Black & Decker, Inc.
INVESTING ACTIVITIES
Business acquisitions, net of cash acquired		(93.8)
Niscayah [Member] | The Black & Decker Corporation
INVESTING ACTIVITIES
Business acquisitions, net of cash acquired		0
Niscayah [Member] | Non-Guarantor Subsidiaries
INVESTING ACTIVITIES
Business acquisitions, net of cash acquired		(20.9)
Niscayah [Member] | Eliminations
INVESTING ACTIVITIES
Business acquisitions, net of cash acquired		$ 0