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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
May 31, 2016 | May 31, 2015 | May 31, 2014
Income Tax [Line Items] |  |  |
U.S. federal foreign tax credit carryforwards beginning expiration year | 2026 |  |
Foreign capital loss carryforwards | $ 14,700,000 |  |
Foreign tax and other credit carryforwards |  | $ 12,000,000 |
Reduction in foreign tax credit carryforwards | 2,400,000 | 1,500,000 |
Total Valuation Allowances | 60,103,000 | 68,043,000 |
Unrecognized tax benefits that would impact effective tax rate, if recognized | 3,900,000 | 3,900,000 | $ 15,000,000
Accrued interest and penalties related to unrecognized tax benefits | 2,800,000 | 3,800,000 | $ 5,200,000
Undistributed foreign earnings | 377,300,000 | 419,100,000 |
Deferred income tax liability | 98,520,000 | $ 108,508,000 |
Reduction to deferred tax liability related to foreign currency revaluation | 6,000,000 |  |
Remaining undistributed foreign earnings | 1,100,000,000 |  |
Provision for deferred income taxes | 0 |  |
Foreign Tax Credits |  |  |
Income Tax [Line Items] |  |  |
U.S. federal foreign tax credit carryforwards | 16,200,000 |  |
Reduction in valuation allowance | 5,800,000 |  |
State |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carryforwards | $ 61,600,000 |  |
Net operating loss carryforwards beginning expiration year | 2017 |  |
Foreign Net Operating Loss Carryforwards |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carryforwards | $ 158,600,000 |  |
Net operating loss carryforwards beginning expiration year | 2017 |  |
Net operating loss carryforwards subject to expiration | $ 24,200,000 |  |
Net operating loss carryforwards indefinite carry forward period | $ 134,400,000 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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