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Summary of Significant Accounting Policies and Related Information - Intangibles (Details) | 12 Months Ended
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Feb. 28, 2019 USD ($)
Goodwill, intangible and other long-lived assets and impairments |
Impairment of intangible assets (excluding goodwill) | $ 0
Minimum |
Economic useful lives and amortization of intangible assets |
Amortization period | 5 years
Maximum |
Economic useful lives and amortization of intangible assets |
Amortization period | 30 years
Patent |
Economic useful lives and amortization of intangible assets |
Amortization period | 14 years

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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