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Segment and Geographic Information - Summary of Net Sales by Product Category (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Segment Reporting Information [Line Items]        
Net sales $ 89,234 $ 92,149 $ 172,937 $ 179,480
Peripheral Vascular [Member]        
Segment Reporting Information [Line Items]        
Net sales 51,051 49,440 98,158 96,801
Vascular Access [Member]        
Segment Reporting Information [Line Items]        
Net sales 25,023 27,968 49,667 54,393
Oncology/Surgery [Member]        
Segment Reporting Information [Line Items]        
Net sales 12,422 13,634 23,706 25,996
Supply Agreement [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 738 $ 1,107 $ 1,406 $ 2,290