Employee Stock Incentive Plans - Summary of Activities in Cash Settled Restricted Stock Unit Option Plans (Detail) - Employee restricted stock unit option plans [member] - shares	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Numbers, Outstanding at the beginning of the year	0	7,000	11,800
Numbers, Exercised	0	0	(4,800)
Forfeited and expired	0	(7,000)	0
Numbers, Outstanding at the end of the year	0	0	7,000
Exercisable at the end of the year	0	0	7,000

The number of share options outstanding in a share-based payment arrangement.

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+ Details