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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

X

- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

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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.

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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.

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Represents the approximate future taxable income required to realize the deferred tax asset attributable to deductible operating loss carryforwards that are 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.

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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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards 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 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 30
-Paragraph 5
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=64814285&loc=d3e30536-109315

Reference 3: 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

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