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Summary of Significant Accounting Policies and Related Information - Intangibles (Details)	12 Months Ended
	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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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.

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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

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