Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Earnings per share [abstract]
Earnings (loss) attributable to ordinary shareholders (including Class B shareholders) used in computing basic earnings (loss) per share (A)	$ 95,101	$ 216,801	$ (11,321)
Interest expense and changes in carrying amount of convertible notes, net of tax		(10,857)
Earnings (loss) attributable to ordinary shareholders (including Class B shareholders) used in computing diluted earnings (loss) per share (B)	$ 95,101	$ 205,944	$ (11,321)
Weighted average number of ordinary shares (including Class B shares) outstanding used in computing basic earnings (loss) per share (C)	112,592,774	111,094,561	109,656,200
Dilutive effect of conversion of convertible notes	5,934,810	5,934,810	5,934,810
Dilutive effect of share based awards	1,945,409	1,206,485	1,336,069
Weighted average number of ordinary shares (including Class B shares) outstanding used in computing dilutive earnings (loss) per share (D)	114,538,183	118,235,856	109,656,200
Basic (A/C)	$ 0.84	$ 1.95	$ (0.1)
Diluted (B/D)	$ 0.83	$ 1.74	$ (0.1)

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed conversion of the entity's convertible instruments.

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The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]

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The profit (loss) attributable to ordinary equity holders of the parent entity, adjusted for the effects of all dilutive potential ordinary shares. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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Interest expense and changes in carrying amount of convertible notes, net of tax.

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