Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Revenue Recognition, Multiple-Deliverable Arrangements (Details)	12 Months Ended
	Feb. 28, 2021
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Term Subscription Contract Duration	4 years
Software maintenance revenue term	1 year
Maximum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
License Revenue Term - BlackBerry Spark	3 years
Minimum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
License Revenue Term - BlackBerry Spark	1 year