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Summary of Significant Accounting Policies and Related Information - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Goodwill, intangible and other long-lived assets and impairments
Impairment of intangible assets (excluding goodwill)	$ 0
Intangible asset amortization	18,854	$ 22,024	$ 21,514
Goodwill
Goodwill deductible for tax purposes	$ 19,000	$ 113,000
Minimum
Economic useful lives and amortization of intangible assets
Amortization period	4 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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- References

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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