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Segments and Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
May 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2014
May 31, 2013
May 31, 2012
Summary of total net sales by product category                      
Total $ 94,065 $ 88,195 $ 88,616 $ 83,579 $ 90,042 $ 81,571 $ 87,007 $ 83,406 $ 354,455 $ 342,026 $ 221,787
Peripheral Vascular [Member]
                     
Summary of total net sales by product category                      
Total                 192,656 179,683 95,200
Access [Member]
                     
Summary of total net sales by product category                      
Total                 106,394 106,690 63,857
Oncology/Surgery [Member]
                     
Summary of total net sales by product category                      
Total                 49,360 47,155 62,730
Supply Agreement [Member]
                     
Summary of total net sales by product category                      
Total                 $ 6,045 $ 8,498 $ 0