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Segments and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2018	May 31, 2017	May 31, 2016
Net sales by Product Category
Net sales	$ 88,317	$ 83,851	$ 86,706	$ 85,411	$ 86,914	$ 85,602	$ 89,029	$ 88,098	$ 344,285	$ 349,643	$ 353,890
Peripheral Vascular
Net sales by Product Category
Net sales									202,334	208,602	205,620
Vascular Access
Net sales by Product Category
Net sales									92,760	96,481	99,375
Oncology/Surgery
Net sales by Product Category
Net sales									$ 49,191	$ 44,560	$ 48,895

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Net Sales by Product Category [Abstract]

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No definition available.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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