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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis and Categorized using Fair Value Hierarchy (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Nov. 30, 2024 | May 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale debt securities | $ 23,263 | $ 26,697
Total marketable equity securities | 153,984 | 127,626
Assets (liabilities) at fair value |  | 152,094
U.S. Treasury and other government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale debt securities | 23,120 | 26,559
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale debt securities | 143 | 138
Stocks | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 1,688 | 1,518
Stocks | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 10,223 | 9,028
Mutual funds | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 44,127 | 39,114
Mutual funds | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 97,946 | 77,966
Contingent consideration liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration |  | (2,229)
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 11,911 | 10,546
Assets (liabilities) at fair value | 11,911 | 10,546
Quoted Prices in Active Markets for Identical Assets (Level 1) | Stocks | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 1,688 | 1,518
Quoted Prices in Active Markets for Identical Assets (Level 1) | Stocks | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 10,223 | 9,028
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale debt securities | 23,263 | 26,697
Total marketable equity securities | 142,073 | 117,080
Assets (liabilities) at fair value | 165,336 | 143,777
Significant Other Observable Inputs (Level 2) | U.S. Treasury and other government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale debt securities | 23,120 | 26,559
Significant Other Observable Inputs (Level 2) | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale debt securities | 143 | 138
Significant Other Observable Inputs (Level 2) | Mutual funds | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 44,127 | 39,114
Significant Other Observable Inputs (Level 2) | Mutual funds | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | $ 97,946 | 77,966
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets (liabilities) at fair value |  | (2,229)
Significant Unobservable Inputs (Level 3) | Contingent consideration liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration |  | $ (2,229)

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