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Material accounting policies - Additional information (Details) | 12 Months Ended
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Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($)
Material accounting policies |  |  |
Closing rate | 0.738 | 0.7389 |
Average rate | 0.7415 | 0.7559 | 0.8003

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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Balance Type: | na
Period Type: | duration

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | pbm_
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Balance Type: | na
Period Type: | duration