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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2011
Mar. 31, 2013
Biological Indicators
Mar. 31, 2012
Biological Indicators
Mar. 31, 2011
Biological Indicators
Mar. 31, 2013
Instruments
Mar. 31, 2011
Instruments
Goodwill and Intangible Assets              
Beginning of period $ 14,450 $ 14,450 $ 9,279 $ 9,279 $ 9,279 $ 5,171 $ 5,171
Acquisitions 9,190         9,190  
End of period $ 23,640 $ 14,450 $ 9,279 $ 9,279 $ 9,279 $ 14,361 $ 5,171