Quarterly financial data (unaudited) (Detail) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 03, 2017 USD ($) item $ / shares	Oct. 28, 2016 USD ($) item $ / shares	Jul. 29, 2016 USD ($) item $ / shares	Apr. 29, 2016 USD ($) item $ / shares	Jan. 29, 2016 USD ($) item $ / shares	Oct. 30, 2015 USD ($) item $ / shares	Jul. 31, 2015 USD ($) item $ / shares	May 01, 2015 USD ($) item $ / shares	Feb. 03, 2017 USD ($) item $ / shares	Jan. 29, 2016 USD ($) $ / shares	Jan. 30, 2015 USD ($) $ / shares
Selected unaudited quarterly financial data
Number of weeks in a quarter | item	14	13	13	13	13	13	13	13
Net sales	$ 6,009,246	$ 5,320,029	$ 5,391,891	$ 5,265,432	$ 5,286,938	$ 5,067,048	$ 5,095,904	$ 4,918,672	$ 21,986,598	$ 20,368,562	$ 18,909,588
Gross profit	1,900,747	1,587,510	1,681,767	1,612,614	1,682,269	1,536,962	1,588,155	1,498,705	6,782,638	6,306,091	5,802,507
Operating profit	680,618	392,991	509,097	480,743	612,429	423,859	475,812	428,194	2,063,449	1,940,294	1,769,093
Net income	$ 414,176	$ 235,315	$ 306,518	$ 295,124	$ 376,175	$ 253,321	$ 282,349	$ 253,235	$ 1,251,133	$ 1,165,080	$ 1,065,345
Basic earnings per share (in dollars per share) | $ / shares	$ 1.50	$ 0.84	$ 1.08	$ 1.03	$ 1.30	$ 0.87	$ 0.95	$ 0.84	$ 4.45	$ 3.96	$ 3.50
Diluted earnings per share (in dollars per share) | $ / shares	$ 1.49	$ 0.84	$ 1.08	$ 1.03	$ 1.30	$ 0.86	$ 0.95	$ 0.84	$ 4.43	$ 3.95	$ 3.49
Number of stores acquired | item	42								42
Number of stores closing | item	40								40
Selling, general and administrative expenses	$ (4,500)	$ 11,000
Selling, general and administrative expenses, net of tax	$ (2,800)	$ 6,700
Effect of pre-tax asset purchase on earnings per diluted share (in dollars per share) | $ / shares	$ 0.01	$ (0.02)
Restructuring Charges						$ 6,100
Restructuring charges, net of tax						$ 3,700
Effect of pre-tax restructuring charges on earnings per diluted share (in dollars per share) | $ / shares						$ (0.01)