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Assets and Liabilities Measured at Fair Value on Recurring Basis and Categorized using Fair Value Hierarchy (Detail) - Fair Value,Measurements Recurring - USD ($) $ in Thousands | Aug. 31, 2021 | May 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | $ 26,946 | $ 26,745
Total marketable equity securities | 148,656 | 142,087
Assets (liabilities) at fair value | 161,560 | 155,497
U.S. Treasury and other government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 26,758 | 26,563
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 188 | 182
Stocks | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 949 | 768
Stocks | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 7,295 | 6,975
Mutual funds | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 48,770 | 47,916
Mutual funds | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 91,642 | 86,428
Contingent consideration liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration | (14,042) | (13,335)
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 0 | 0
Total marketable equity securities | 8,244 | 7,743
Assets (liabilities) at fair value | 8,244 | 7,743
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury and other government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 0 | 0
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 | 949 | 768
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 | 7,295 | 6,975
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Contingent consideration liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 26,946 | 26,745
Total marketable equity securities | 140,412 | 134,344
Assets (liabilities) at fair value | 167,358 | 161,089
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 securities | 26,758 | 26,563
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 securities | 188 | 182
Significant Other Observable Inputs (Level 2) | Stocks | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 0 | 0
Significant Other Observable Inputs (Level 2) | Stocks | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 0 | 0
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 | 48,770 | 47,916
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 | 91,642 | 86,428
Significant Other Observable Inputs (Level 2) | Contingent consideration liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 0 | 0
Total marketable equity securities | 0 | 0
Assets (liabilities) at fair value | (14,042) | (13,335)
Significant Unobservable Inputs (Level 3) | U.S. Treasury and other government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Stocks | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Stocks | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Mutual funds | Foreign |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Mutual funds | Domestic |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable equity securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Contingent consideration liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration | $ (14,042) | $ (13,335)

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- Definition Disclosure of assets and liabilities, including financial instruments measured at fair value, on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References No definition available. + Details
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