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Balance Sheets-Additional Information (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Additional Information Of Balance Sheet [Line Items]    
Equity Method Investments $ 4,235 $ 4,580
Accumulated depreciation 3,558 5,180
Construction-in-progress 2,690 5,595
Deferred consideration on acquisitions   1,250
Understated amount of goodwill and a liability for deferred consideration on acquisitions 2,861  
Accrued compensation related to service of a key employee 4,107  
Animal Health    
Additional Information Of Balance Sheet [Line Items]    
Equity Method Investments $ 3,719 $ 4,076