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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2014 | May 31, 2013 | May 31, 2012
Income Tax [Line Items] |  |  |
U.S. federal foreign tax credit carryforwards beginning expiration year | 2021 |  |
Foreign capital loss carryforwards | $ 19,200,000 |  |
Reduction in foreign tax credit carryforwards | 500,000 |  |
Total Valuation Allowances | 85,719,000 | 89,909,000 |
Unrecognized tax benefits that would impact effective tax rate, if recognized | 15,000,000 | 7,500,000 | 2,400,000
Accrued interest and penalties related to unrecognized tax benefits | 5,200,000 | 5,200,000 | 1,500,000
Foreign Tax Credits |  |  |
Income Tax [Line Items] |  |  |
U.S. federal foreign tax credit carryforwards | 9,700,000 |  |
Reduction in valuation allowance | (4,700,000) |  |
State |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carryforwards | 37,600,000 |  |
Net operating loss carryforwards beginning expiration year | 2015 |  |
Foreign Net Operating Loss Carryforwards |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carryforwards beginning expiration year | 2015 |  |
Net operating loss carryforwards | 182,900,000 |  |
Net operating loss carryforwards subject to expiration | 35,400,000 |  |
Net operating loss carryforwards indefinite carry forward period | $ 147,500,000 |  |

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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=6907707&loc=d3e32537-109319 + Details
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