Commitments and contingencies - (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 02, 2018	Feb. 03, 2017	Jan. 29, 2016
Future minimum payments for operating leases
2018	$ 1,088,538
2019	1,041,729
2020	969,829
2021	897,913
2022	825,846
Thereafter	4,284,309
Total minimum payments	9,108,164
Total minimum payments for capital leases	15,200
Present value of net minimum capital lease payments	12,300
Gross property and equipment recorded under capital lease	36,200	$ 29,800
Accumulated depreciation on property and equipment recorded under capital lease	12,400	14,300
Operating lease rent expenses
Minimum rentals	1,075,984	935,663	$ 849,115
Contingent rentals	5,532	6,748	7,793
Operating lease rent expenses	$ 1,081,516	$ 942,411	$ 856,908
Maximum
Operating Leased Assets [Line Items]
Typical period of primary lease term for operating lease, build-to-suit, maximum	15 years