Dollar Tree, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Stock-Based Compensation Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2026	Feb. 01, 2025	Feb. 03, 2024
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 67.1	$ 124.9	$ 96.7
Excess tax benefit (deficit) on stock-based compensation recognized in the provision for income taxes	(5.4)	(0.9)	3.9
Cost of sales
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	13.5	13.9	11.9
Selling, general and administrative expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	45.4	93.0	64.4
Income (loss) from discontinued operations, net of tax
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 8.2	$ 18.0	$ 20.4