Current and long-term obligations (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 30, 2015	Oct. 30, 2015	Oct. 20, 2015	Jan. 30, 2015
Current and long-term obligations
Debt issuance costs, net	$ (19,151)	$ (19,151)		$ (15,462)
Current and long-term obligations	3,106,690	3,106,690		2,725,123
Less: current portion	(1,358)	(1,358)		(101,158)
Long-term portion	3,105,332	3,105,332		2,623,965
Letters of credit outstanding	43,700	43,700
Loss on debt retirement, net		326
Senior unsecured credit facility, Term Facility
Current and long-term obligations
Current and long-term obligations	$ 425,000	$ 425,000		925,000
Amount borrowed			$ 425,000
Senior unsecured credit facility, maturity October 20, 2020
Current and long-term obligations
Debt issue costs			2,600
Commitment fee rate	0.15%	0.15%
Weighted average interest rate (as a percent)	1.36%	1.36%
Loss on debt retirement, net	$ 300	$ 300
Senior unsecured credit facility, maturity October 20, 2020 | LIBOR loans
Current and long-term obligations
Variable rate basis	LIBOR	LIBOR
Spread on variable rate (as a percent)	1.10%	1.10%
Senior unsecured credit facility, maturity October 20, 2020 | Base-rate loans
Current and long-term obligations
Variable rate basis	base rate	base rate
Spread on variable rate (as a percent)	0.10%	0.10%
Senior unsecured credit facility, maturity October 20, 2020, Revolving Facility
Current and long-term obligations
Current and long-term obligations	$ 388,000	$ 388,000
Maximum financing under credit agreements			1,000,000
Borrowing availability under credit facility	582,800	582,800
Senior unsecured credit facility, maturity October 20, 2020, Revolving Facility | Letters of credit
Current and long-term obligations
Maximum financing under credit agreements	175,000	175,000	175,000
Letters of credit outstanding	$ 29,200	$ 29,200
Senior notes
Current and long-term obligations
Redemption price as a percentage of principal amount	101.00%	101.00%
4.125% Senior Notes due July 15, 2017
Current and long-term obligations
Current and long-term obligations	$ 500,000	$ 500,000		$ 500,000
Stated interest rate (as a percent)	4.125%	4.125%		4.125%
1.875% Senior Notes due April 15, 2018
Current and long-term obligations
Current and long-term obligations	$ 399,774	$ 399,774		$ 399,706
Discount on debt issuance	226	226		$ 294
Amount borrowed	$ 400,000	$ 400,000
Stated interest rate (as a percent)	1.875%	1.875%		1.875%
3.25% Senior Notes due April 15, 2023
Current and long-term obligations
Current and long-term obligations	$ 898,170	$ 898,170		$ 898,009
Discount on debt issuance	1,830	1,830		$ 1,991
Amount borrowed	$ 900,000	$ 900,000
Stated interest rate (as a percent)	3.25%	3.25%		3.25%
4.150% Senior Notes due Nov 1, 2025
Current and long-term obligations
Current and long-term obligations	$ 499,220	$ 499,220
Discount on debt issuance	780	780	800
Debt issue costs	$ 4,400	$ 4,400
Amount borrowed			$ 500,000
Stated interest rate (as a percent)	4.15%	4.15%	4.15%
Capital lease obligations
Current and long-term obligations
Current and long-term obligations	$ 5,087	$ 5,087		$ 5,875
Tax increment financing due February 1, 2035
Current and long-term obligations
Current and long-term obligations	$ 10,590	$ 10,590		$ 11,995