Consolidated Balance Sheets Detail - Property, Plant and Equipment (Details) - USD ($) $ in Millions |
May 31, 2026 |
Feb. 28, 2026 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Cost of property, plant and equipment | $ 100.0 | $ 98.2 |
| Accumulated amortization | 86.9 | 85.9 |
| Net book value | 13.1 | 12.3 |
| BlackBerry operations and other information technology | ||
| Property, Plant and Equipment [Line Items] | ||
| Cost of property, plant and equipment | 79.2 | 78.0 |
| Leasehold improvements and other | ||
| Property, Plant and Equipment [Line Items] | ||
| Cost of property, plant and equipment | 13.4 | 12.9 |
| Furniture and Fixtures [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Cost of property, plant and equipment | 4.7 | 4.8 |
| Manufacturing, repair and research and development equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Cost of property, plant and equipment | $ 2.7 | $ 2.5 |