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Intangible Assets - Summary of Detailed Information About Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance | [1] | $ 4,640 |  |
Ending Balance |  | 311 | $ 4,640 | [1]
Gross carrying amount [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance |  | 6,088 | 5,829 |
Additions |  |  | 328 |
Reclassified as held for sale (note 15) |  | (5,773) |  |
Exchange realignment |  | 13 | (69) |
Ending Balance |  | 328 | 6,088 |
Accumulated impairment [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance |  | (1,448) | (625) |
Charge for the year |  | 833 | 837 |
Reclassified as held for sale (note 15) |  | 2,268 |  |
Exchange realignment |  | 4 | (14) |
Ending Balance |  | (17) | (1,448) |
Developed technology [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance |  | 4,473 |  |
Ending Balance |  | 153 | 4,473 |
Developed technology [member] | Gross carrying amount [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance |  | 5,913 | 5,829 |
Additions |  |  | 151 |
Reclassified as held for sale (note 15) |  | (5,773) |  |
Exchange realignment |  | 13 | (67) |
Ending Balance |  | 153 | 5,913 |
Developed technology [member] | Accumulated impairment [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance |  | (1,440) | (625) |
Charge for the year |  | 824 | 829 |
Reclassified as held for sale (note 15) |  | 2,268 |  |
Exchange realignment |  | 4 | (14) |
Ending Balance |  | 0 | (1,440) |
Brand name[member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance |  | 167 |  |
Ending Balance |  | 158 | 167 |
Brand name[member] | Gross carrying amount [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance |  | 175 | 0 |
Additions |  |  | 177 |
Reclassified as held for sale (note 15) |  | 0 |  |
Exchange realignment |  | 0 | (2) |
Ending Balance |  | 175 | 175 |
Brand name[member] | Accumulated impairment [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Beginning Balance |  | (8) | 0 |
Charge for the year |  | 9 | 8 |
Reclassified as held for sale (note 15) |  | 0 |  |
Exchange realignment |  | 0 | 0 |
Ending Balance |  | $ (17) | $ (8) |
[1] | The comparative consolidated financial statements have been re-presented from Hong Kong dollar to US$ to reflect the Company’s change in presentation currency. See note 1.

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The decrease in intangible assets and goodwill resulting from classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2022-03-24 + Details
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