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Financial Instruments - Summary of Reconciliation of Level 3 fair value measurements (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Disclousre of Detailed Information about Reconciliation of Level3 Fair Value Measurements Explanatory [Line Items] |  |  |  |  |
Beginning Balance | [1] | $ 410,505 |  |  |
Exchange realignment |  | (151) |  |  | $ (171)
Ending Balance |  | 661,676 | $ 410,505 | [1] |
Level 3 of fair value hierarchy [member] |  |  |  |  |
Disclousre of Detailed Information about Reconciliation of Level3 Fair Value Measurements Explanatory [Line Items] |  |  |  |  |
Beginning Balance |  | 18,642 | 36,571 |  |
Total gains in profit or loss |  | 15,386 | 16,935 |  |
Transfer from Level 2 to Level 3 |  |  | 796 |  |
New investment |  | 5,545 |  |  |
Receipt of investment return |  |  | (2,681) |  |
Disposals |  | (25,650) | (32,712) |  |
Exchange realignment |  | 1 | (267) |  |
Ending Balance |  | 13,924 | 18,642 |  | 36,571
Unlisted Investments Classified as Equity Investments F V T P L [Member] | Level 3 of fair value hierarchy [member] |  |  |  |  |
Disclousre of Detailed Information about Reconciliation of Level3 Fair Value Measurements Explanatory [Line Items] |  |  |  |  |
Beginning Balance |  | 10,603 | 26,126 |  |
Total gains in profit or loss |  | 15,036 | 16,564 |  |
Transfer from Level 2 to Level 3 |  |  | 796 |  |
Disposals |  | (25,650) | (32,712) |  |
Exchange realignment |  | 11 | (171) |  |
Ending Balance |  | 0 | 10,603 |  | 26,126
Movie Income Right Investments [Member] | Level 3 of fair value hierarchy [member] |  |  |  |  |
Disclousre of Detailed Information about Reconciliation of Level3 Fair Value Measurements Explanatory [Line Items] |  |  |  |  |
Beginning Balance |  | 8,039 | 10,445 |  |
Total gains in profit or loss |  | 350 | 371 |  |
New investment |  | 5,545 |  |  |
Receipt of investment return |  |  | (2,681) |  |
Exchange realignment |  | (10) | (96) |  |
Ending Balance |  | $ 13,924 | $ 8,039 |  | $ 10,445
[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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