Nature of Business and Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jul. 29, 2012 Segment Location	Jan. 29, 2012
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of professional customer	440,000
SKUs of name brand and propriety brand products offering	1,000,000
Product offering, locations	630
Product offering, states and provinces	46
Reportable segment	4
Self-insurance reserves	$ 98	$ 101
Foreign Country
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Product offering, states and provinces	9