- Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Additional Information (Details) endpoint in Millions	12 Months Ended
	Feb. 28, 2021 endpoint
Additional Information [Line Items]
Number of endpoints secured	500
Number of endpoints secured, cars	175
Liability for uncertain income tax positions, percentage minimum	50.00%
Minimum
Additional Information [Line Items]
Maturity period of long-term investments	1 year
Maximum
Additional Information [Line Items]
Maturity period of cash equivalents	3 months
Maturity period of short-term investments	1 year