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Income Taxes - Operating loss carryforwards (Details) - USD ($) $ in Thousands | Feb. 28, 2018 | Feb. 28, 2017
--- | --- | ---
Gross deferred tax assets |  |
Subtotals | $ 32,829 | $ 16,799
Less portion of valuation allowance established for operating loss carryforwards | (16,406) |
Total | 16,423 |
Required future taxable income |  |
Subtotals | 140,145 |
U.S. |  |
Gross deferred tax assets |  |
Operating loss carryforwards with indefinite carryover periods | 16,549 |
Required future taxable income |  |
Required future taxable income - operating loss carryforwards with indefinite carryover periods | 81,856 |
Non-U.S. |  |
Gross deferred tax assets |  |
Operating loss carryforwards with definite carryover periods | 2,103 |
Operating loss carryforwards with indefinite carryover periods | 14,177 |
Required future taxable income |  |
Required future taxable income - operating loss carryforwards with definite carryover periods | 7,853 |
Required future taxable income - operating loss carryforwards with indefinite carryover periods | $ 50,436 |

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- Definition Represents the approximate future taxable income required to realize the deferred tax asset attributable to deductible operating loss carryforwards, before assessment that it is more likely than not that all or a portion of such income will not be realized on future tax returns. + References No definition available. + Details
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- Definition Represents the approximate future taxable income required to realize the deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates, before assessment that it is more likely than not that all or a portion of such income will not be realized on future tax returns. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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