Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Jan. 30, 2021 USD ($) segment store	Feb. 01, 2020 USD ($) segment	Feb. 02, 2019 USD ($) segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of DICK'S Sporting Goods stores | store	728
Number of weeks in fiscal period	52 weeks	52 weeks	52 weeks
Cash and Cash Equivalents / Cash Management
Checks drawn in excess of cash balances not yet presented for payment	$ 111.2	$ 54.0
Accounts Receivable
Allowance for credit losses	2.7	3.0
Inventories
Inventory valuation and vendor allowances	101.3	131.7
Advertising Costs
Advertising expense net of cooperative advertising	$ 293.4	$ 338.7	$ 322.2
Operating Segment Information
Number of reportable segments | segment	1	1	1