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Acquisitions (Pro Forma) (Details) - Insight Pharmaceuticals Corporation - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Pro Forma Information    
Revenues $ 783,217 $ 767,897
Net income $ 86,844 $ 82,762
Earnings per share:    
Basic (USD per share) $ 1.66 $ 1.60
Diluted (USD per share) $ 1.65 $ 1.58