Segment and Geographic Information - Summary of Net Sales by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 72,770	$ 70,003	$ 142,986	$ 136,045
Vascular Interventions & Therapies
Segment Reporting Information [Line Items]
Net sales	33,900	31,150	63,757	60,063
Vascular Access
Segment Reporting Information [Line Items]
Net sales	23,930	22,784	52,035	45,943
Oncology
Segment Reporting Information [Line Items]
Net sales	$ 14,940	$ 16,069	$ 27,194	$ 30,039