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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) - USD ($) $ in Thousands | May 31, 2019 | May 31, 2018
--- | --- | ---
Deferred income tax liabilities |  |
Indefinite and long-lived assets | $ (18,963) | $ (17,503)
Prepaid expenses | (586) | (573)
Deferred Tax Liabilities, Gross | (19,549) | (18,076)
Deferred income tax assets |  |
Stock Options | 1,497 | 1,489
Inventories and accounts receivable | 1,315 | 1,593
Tax loss carryforwards | 417 | 134
Valuation allowance on tax loss carryforwards | (407) |
Accrued expenses and other | 1,109 | 757
Deferred Tax Assets, Net of Valuation Allowance, Total | 3,931 | 3,973
Net deferred income tax liabilities | $ (15,618) | $ (14,103)

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