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Financial Instruments - Summary of Financial Assets that are Measured at Fair Value on a Recurring Basis (Parenthetical) (Detail) $ in Thousands | 12 Months Ended
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Apr. 30, 2023 USD ($) | Apr. 30, 2022 USD ($)
Financial assets at FVTPL - unlisted equity securities [Member] | Level 3 of fair value hierarchy [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Percentage of reasonably possible increase in unobservable input, assets | 5.00% | 5.00%
Percentage of reasonably possible decrease in unobservable input, assets | 5.00% | 5.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | $ 102
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, assets |  | $ 108
Movie Income Right Investments [Member] | Level 3 of fair value hierarchy [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Percentage of reasonably possible increase in unobservable input, assets | 5.00% |
Percentage of reasonably possible decrease in unobservable input, assets |  | 5.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | $ 60 | $ 691
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, assets | $ 529 | $ 603
Historical volatility for shares, measurement input [member] | Financial assets at FVTPL - unlisted equity securities [Member] | Level 3 of fair value hierarchy [member] | Bottom of range [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets |  | 57.4
Historical volatility for shares, measurement input [member] | Financial assets at FVTPL - unlisted equity securities [Member] | Level 3 of fair value hierarchy [member] | Top of range [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets |  | 68.6
Discount rate, measurement input [member] | Movie Income Right Investments [Member] | Bottom of range [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets | 10.4 |
Discount rate, measurement input [member] | Movie Income Right Investments [Member] | Top of range [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets |  | 13.67
Discount rate, measurement input [member] | Movie Income Right Investments [Member] | Level 3 of fair value hierarchy [member] | Bottom of range [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets | 10.4 |
Discount rate, measurement input [member] | Movie Income Right Investments [Member] | Level 3 of fair value hierarchy [member] | Top of range [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Significant unobservable input, assets |  | 12.59

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