Stock Compensation Plans - Summary of Issuance of Shares, Stock-Based Compensation Cost and Related Tax Benefits (Detail) - USD ($) shares in Thousands, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Stock based compensation cost | $ 1,976 | $ 1,828 | $ 1,188 |
| Related tax benefits | $ 454 | $ 420 | $ 264 |
| Employee Stock Purchase Plan [Member] | |||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Issued from common stock | 21 | 34 | 50 |
| Stock based compensation cost | $ 155 | $ 129 | $ 91 |
| Related tax benefits | $ 36 | $ 30 | $ 20 |