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Stock-Based Compensation - Summary of Non-Vested Stock Option Awards (Detail) - $ / shares shares in Thousands | 12 Months Ended
--- | ---
May 31, 2026 | May 31, 2025 | May 31, 2024
Number of Stock Options |  |  |
Non-vested, beginning of year | 60,670 |  |
Granted | 0 | 54,200 | 58,000
Vested | (30,455) |  |
Forfeited | 0 |  |
Non-vested, end of year | 30,215 | 60,670 |
Weighted Average Grant Date Fair Value Per Common Share |  |  |
Non-vested, beginning of year | $ 16.23 |  |
Granted | 0 |  |
Vested | 15.04 |  |
Forfeited | 0 |  |
Non-vested, end of year | $ 17.43 | $ 16.23 |

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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of non-vested options outstanding. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-4 + Details
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- Definition Number of non-vested options forfeited. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-4 + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-4 + Details
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- Definition Number of options vested. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-4 + Details
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