Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Adoption of Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 29, 2024	Feb. 28, 2023
Reclassification [Line Items]
Facilities Reclass - Cost of Sales Previously Reported	$ 332.7	$ 237.0
Facilities Reclass - Gross Margin Previously Reported	520.0	418.9
Facility Costs	(8.6)	(9.8)
Facilities reclass - impact to Gross Margin	8.6	9.8
Facilities reclass - impact to Research and development	(12.6)	(12.9)
Facilities reclass - impact to Sales and marketing	(7.1)	(7.8)
Facilities reclass - impact to General and administrative	28.3	30.5
Facilities reclass - impact to Cybersecurity Segment cost of sales	(5.8)	(7.1)
Facilities reclass - impact to Cybersecurity Segment gross margin	5.8	7.1
Facilities reclass - impact to IoT Segment cost of sales	(2.5)	(2.2)
Facilities reclass - impact to IoT Segment gross margin	2.5	2.2
Facilities Reclass - Research and Development Previously Reported	185.7	207.3
Facilities Reclass - Sales and Marketing Previously Reported	171.0	176.2
Facilities Reclass - General and administrative Previously Reported	180.6	163.6
Facilities Reclass - Cybersecurity Segment COS Previously Reported	141.6	184.8
Facilities Reclass - Cybersecurity Segment GM Previously Reported	235.8	233.0
Facilities Reclass - IoT Segment COS Previously Reported	36.3	37.0
Facilities Reclass - IoT Segment GM Previously Reported	179.1	168.7
Facilities Reclass - Cost of Sales Revised	324.1	227.2
Facilities Reclass - Gross Margin Revised	528.6	428.7
Facilities Reclass - Research and Development Revised	173.1	194.4
Facilities Reclass - Sales and Marketing Revised	163.9	168.4
Facilities Reclass - General and administrative Revised	208.9	194.1
Facilities Reclass - Cybersecurity Segment COS Revised	135.8	177.7
Facilities Reclass - Cybersecurity Segment GM Revised	241.6	240.1
Facilities Reclass - IoT Segment COS Revised	33.8	34.8
Facilities Reclass - IoT Segment GM Revised	$ 181.6	$ 170.9