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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Income Tax [Line Items] |  |  |
U.S. federal foreign tax credit carryforwards beginning expiration year | 2025 |  |
Foreign capital loss carryforwards | $ 15,400 |  |
Reduction in foreign tax credit carryforwards | 1,500 |  |
Total Valuation Allowances | 68,043 | $ 85,719 |
Unrecognized tax benefits that would impact effective tax rate, if recognized | 3,900 | 15,000 | $ 7,500
Accrued interest and penalties related to unrecognized tax benefits | 3,800 | $ 5,200 | $ 5,200
Foreign Tax Credits |  |  |
Income Tax [Line Items] |  |  |
U.S. federal foreign tax credit carryforwards | 27,700 |  |
Reduction in valuation allowance | 12,000 |  |
State |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carryforwards | $ 67,400 |  |
Net operating loss carryforwards beginning expiration year | 2016 |  |
Foreign Net Operating Loss Carryforwards |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carryforwards | $ 154,700 |  |
Net operating loss carryforwards beginning expiration year | 2016 |  |
Net operating loss carryforwards subject to expiration | $ 26,400 |  |
Net operating loss carryforwards indefinite carry forward period | $ 128,300 |  |

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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=6907707&loc=d3e32537-109319 + Details
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