Additional Information - Additional Information (Details) - USD ($) $ in Millions	Nov. 30, 2025	Feb. 28, 2025	Feb. 03, 2025
Supplemental Cash Flow Information [Abstract]
Percentage of cash and cash equivalents denominated in foreign currencies	13.00%	19.00%
Percentage of accounts receivable denominated in foreign currencies	32.00%	29.00%
Percentage of accounts payable denominated in foreign currencies	49.00%	71.00%
Percentage of cash, cash equivalents and investments threshold used to determine major issuer	34.00%	47.00%
Cash, Cash Equivalents And Investments	$ 377.5	$ 410.3
Present Value of Delayed Cash Payment from Cylance Sale	$ 38.1	$ 38.6
Fair value of common shares received from disposal of discontinued operation			$ 24.6

Cash, cash equivalents and investments at fair value.

No definition available.

Name:	bbry_CashCashEquivalentsAndInvestmentsAtFairValue
Namespace Prefix:	bbry_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of common shares received from disposal of discontinued operation

No definition available.

Name:	bbry_FairValueOfCommonSharesReceivedFromDisposalOfDiscontinuedOperation
Namespace Prefix:	bbry_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Percent of cash equivalents and investments threshold used to determine major issuers.

No definition available.

Name:	bbry_PercentOfCashEquivalentsAndInvestmentsThresholdUsedToDetermineMajorIssuers
Namespace Prefix:	bbry_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of accrued liabilities denominated in foreign currencies.

No definition available.

Name:	bbry_PercentageOfAccountsPayableDenominatedInForeignCurrencies
Namespace Prefix:	bbry_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of accounts receivable denominated in foreign currencies.

No definition available.

Name:	bbry_PercentageOfAccountsReceivableDenominatedInForeignCurrencies
Namespace Prefix:	bbry_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of cash and cash equivalents denominated in foreign currencies.

No definition available.

Name:	bbry_PercentageOfCashAndCashEquivalentsDenominatedInForeignCurrencies
Namespace Prefix:	bbry_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Present Value of Delayed Cash Payment from Cylance Sale

No definition available.

Name:	bbry_PresentValueOfDelayedCashPaymentFromCylanceSale
Namespace Prefix:	bbry_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration