Description of Business and Summary of Significant Accounting Policies Research and Development (Details) - USD ($) $ in Thousands	12 Months Ended
Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Research and Development [Abstract]
Research and Development Expense (Excluding Acquired in Process Cost)	$ 32,725	$ 26,458	$ 20,777
Revenue Recognition, Milestone Method, Revenue Recognized	$ 6,636	$ 8,313	$ 7,269

The costs incurred in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Research and Development
-URI http://asc.fasb.org/extlink&oid=6523717

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration