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Immaterial Error Corrections Narrative (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	Nov. 30, 2015	Nov. 30, 2014	Feb. 29, 2016	Feb. 28, 2015	May 31, 2016	May 31, 2015	May 31, 2014	May 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Research and development	$ 6,129	$ 6,551	$ 6,578	$ 6,276	$ 7,188	$ 12,308	$ 13,465	$ 18,116	$ 20,043	$ 25,053	$ 26,594	$ 28,124	$ 26,091
Lease expense										2,500	$ 3,400	$ 2,000
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Intercompany foreign exchange loss										700
Research and development										400
Lease expense										$ 300

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Gain (Loss) on Intercompany Foreign Exchange

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The aggregate costs incurred (1) 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 (2) 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, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

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
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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