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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) - USD ($) $ in Thousands | May. 31, 2015 | May. 31, 2014
--- | --- | ---
Deferred income tax liabilities |  |
Indefinite and long-lived assets | $ (15,906) | $ (13,759)
Prepaid expenses | (431) | (358)
Deferred Tax Liabilities, Gross | (16,337) | (14,117)
Deferred income tax assets |  |
Inventories and accounts receivable | 1,809 | 1,471
Accrued expenses and other | 2,808 | 2,201
Deferred Tax Assets, Net of Valuation Allowance, Total | 4,617 | 3,672
Net deferred income tax liabilities | $ (11,720) | $ (10,445)

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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