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Segments and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2014	May 31, 2013	May 31, 2012
Summary of total net sales by product category
Total	$ 94,065	$ 88,195	$ 88,616	$ 83,579	$ 90,042	$ 81,571	$ 87,007	$ 83,406	$ 354,455	$ 342,026	$ 221,787
Peripheral Vascular [Member]
Summary of total net sales by product category
Total									192,656	179,683	95,200
Access [Member]
Summary of total net sales by product category
Total									106,394	106,690	63,857
Oncology/Surgery [Member]
Summary of total net sales by product category
Total									49,360	47,155	62,730
Supply Agreement [Member]
Summary of total net sales by product category
Total									$ 6,045	$ 8,498	$ 0

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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