Consolidated Balance Sheets Detail - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Nov. 30, 2025	Feb. 28, 2025
Property, Plant and Equipment [Line Items]
Cost of property, plant and equipment	$ 96.9	$ 97.9
Accumulated amortization	85.2	84.5
Net book value	11.7	13.4
BlackBerry operations and other information technology
Property, Plant and Equipment [Line Items]
Cost of property, plant and equipment	77.8	80.6
Leasehold improvements and other
Property, Plant and Equipment [Line Items]
Cost of property, plant and equipment	11.9	10.5
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Cost of property, plant and equipment	4.7	4.6
Manufacturing, repair and research and development equipment
Property, Plant and Equipment [Line Items]
Cost of property, plant and equipment	$ 2.5	$ 2.2

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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