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v3.25.1

Stock Options and Stock-Based Compensation - Stock Compensation Expense for Time Based Options and Performance Based Options (Detail) - USD ($) | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Basic | $ 1.85 | $ 1.48 | $ 1.28
Diluted | $ 1.83 | $ 1.47 | $ 1.26
Time Based Options and Performance Based Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total cost of stock-based compensation included in income before income taxes | $ 5,714,000 | $ 4,982,000 | $ 5,559,000
Amount of income tax benefit recognized | (1,256,000) | (987,000) | (1,210,000)
Amount charged to net income | $ 4,458,000 | $ 3,995,000 | $ 4,349,000
Basic | $ 0.09 | $ 0.08 | $ 0.08
Diluted | $ 0.09 | $ 0.08 | $ 0.08
Time Based Options and Performance Based Options [Member] | Cost of Revenue [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total cost of stock-based compensation included in income before income taxes | $ 2,794,000 | $ 2,797,000 | $ 2,566,000
Time Based Options and Performance Based Options [Member] | General and Administrative [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total cost of stock-based compensation included in income before income taxes | $ 2,920,000 | $ 2,185,000 | $ 2,993,000

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