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Per Share Data - Additional Information (Detail) - shares | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Officer's Compensation Board Incentive Plan |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Number of shares held for incentive plans, to be deducted in calculation of the weighted-average shares for EPS computation | 3,401,500 | 2,932,447

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