Benefit plans (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2023	Jan. 28, 2022	Jan. 29, 2021
Benefit plans
Matching contribution expense related to the Company's 401(k) plan	$ 35.7	$ 34.0	$ 30.1
Compensation expense for the Dollar General Corporation CDP/SERP Plan	$ 1.2	$ 1.3	$ 0.9