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Income Taxes - Reconcilliation of Effective Income Tax Rate (Details) | 12 Months Ended
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Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2017
Income Tax Disclosure [Abstract] |  |  |
Statutory federal income tax rate | 21.00% | 32.70% | 35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent | 0.50% | 1.60% | 0.70%
State income taxes, net of federal income tax benefit | 0.40% | 0.40% | 0.40%
Benefit of Section 199 of the Code, manufacturing deduction | 0.00% | (2.20%) | (2.30%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent | (0.70%) | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent | 0.50% | (0.50%) | (1.80%)
Other | 0.00% | 0.20% | 0.10%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent | (4.10%) | (7.70%) | (3.10%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent | 1.10% | (0.40%) | (0.80%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 0.00% | (78.90%) | 0.00%
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent | 0.00% | 8.60% | 0.00%
Effective income tax rate | 18.70% | (46.20%) | 28.20%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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