Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Revenue Recognition, Multiple-Deliverable Arrangements (Details)	12 Months Ended
	Feb. 29, 2020
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Term Subscription Contract Duration - IoT	4 years
Software maintenance revenue term	1 year
Maximum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
License Revenue Term - BlackBerry Cylance	3 years
Minimum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
License Revenue Term - BlackBerry Cylance	1 year