Financial instruments and financial risk management (Details)	10 Months Ended	12 Months Ended
Jan. 31, 2024 USD ($)	Mar. 31, 2023 CAD ($)
Financial instruments and financial risk management
Fluctuation in foreign exchange rates (as a percent)	10.00%	10.00%
Impact to profit or loss from fluctuation in foreign exchange rates	$ 42,491	$ 5,482

The increase (decrease) in profit and loss as a result of an change in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

No definition available.

Name:	pbm_IncreaseDecreaseInProfitOrLossDueToReasonablyPossibleChangeInDesignatedRiskComponent
Namespace Prefix:	pbm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration