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Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Summary of total net sales by product category
Net sales	$ 87,007	$ 58,099	$ 170,423	$ 112,530
Peripheral Vascular [Member]
Summary of total net sales by product category
Net sales	45,766	23,079	89,060	44,047
Vascular Access [Member]
Summary of total net sales by product category
Net sales	26,712	15,203	53,342	30,800
Vascular [Member]
Summary of total net sales by product category
Net sales	72,478	38,282	142,402	74,847
Oncology/Surgery [Member]
Summary of total net sales by product category
Net sales	12,006	19,817	23,239	37,683
Supply Agreement [Member]
Summary of total net sales by product category
Net sales	$ 2,523		$ 4,782

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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=6880815&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

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