Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Stock-based Compensation (Details)	12 Months Ended
	Feb. 28, 2025 shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of common shares authorized under the Equity Plan (in shares)	60,875,000
RSUs, forfeited, settled in cash or sold to cover withholding tax requirements, counted as (in shares) impact to Equity Plan	1
Shares in the equity pool available for future grants	27,400,000
TBRSU Share Limit	1
PBRSU Share Limit	1.5