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Segments and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	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
Summary of total net sales by product category
Net sales	$ 93,419	$ 87,434	$ 89,284	$ 83,753	$ 90,697	$ 86,597	$ 92,149	$ 87,091	$ 173,037	$ 179,240	$ 260,471	$ 265,837	$ 353,890	$ 356,534	$ 354,425
Peripheral Vascular
Summary of total net sales by product category
Net sales													202,780	192,713	192,626
Vascular Access
Summary of total net sales by product category
Net sales													99,375	107,754	106,394
Oncology/Surgery
Summary of total net sales by product category
Net sales													48,895	51,890	49,360
Supply Agreement
Summary of total net sales by product category
Net sales													$ 2,840	$ 4,177	$ 6,045

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- Definition

Net Sales by Product Category [Abstract]

+ References

No definition available.

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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.

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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=63488584&loc=d3e20235-122688

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