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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 71,182	$ 69,780	$ 214,168	$ 205,825
United States
Disaggregation of Revenue [Line Items]
Net sales	58,654	54,889	173,446	163,381
International
Disaggregation of Revenue [Line Items]
Net sales	12,528	14,891	40,722	42,444
Vascular Interventions & Therapies
Disaggregation of Revenue [Line Items]
Net sales	33,251	30,552	97,008	90,616
Vascular Interventions & Therapies  | United States
Disaggregation of Revenue [Line Items]
Net sales	29,529	26,788	87,198	80,065
Vascular Interventions & Therapies  | International
Disaggregation of Revenue [Line Items]
Net sales	3,722	3,764	9,810	10,551
Vascular Access
Disaggregation of Revenue [Line Items]
Net sales	24,813	24,642	76,848	70,585
Vascular Access | United States
Disaggregation of Revenue [Line Items]
Net sales	21,009	20,018	60,392	57,865
Vascular Access | International
Disaggregation of Revenue [Line Items]
Net sales	3,804	4,624	16,456	12,720
Oncology
Disaggregation of Revenue [Line Items]
Net sales	13,118	14,586	40,312	44,624
Oncology | United States
Disaggregation of Revenue [Line Items]
Net sales	8,116	8,083	25,856	25,451
Oncology | International
Disaggregation of Revenue [Line Items]
Net sales	$ 5,002	$ 6,503	$ 14,456	$ 19,173

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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).

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