Recently Adopted Accounting Pronouncements (Detail) (Accounting Standards Update 2011-05 [Member])	9 Months Ended
	Oct. 27, 2012
Accounting Standards Update 2011-05 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Description	On January 29, 2012, we adopted Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) 2011-05, an amendment to Accounting Standards Codification (ASC) 220, Comprehensive Income. ASU 2011-05 introduces a new statement, the Consolidated Statement of Comprehensive Income, which begins with net income (loss) and adds or deducts other recognized changes in assets and liabilities that are not included in net earnings, but are reported directly to equity, under Generally Accepted Accounting Principles. For example, unrealized changes in pension benefit obligations are included in the measure of comprehensive income but are excluded from net earnings. The amendments became effective for the first quarter 2012 financial statements. The amendments affect only the display of those components of equity categorized as other comprehensive income and do not change existing recognition and measurement requirements that determine net earnings.