ALKERMES INC - FORM 10-Q - XML - IDEA: XBRL DOCUMENT - August 1, 2011



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v2.3.0.11
Investments (Details 2) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2011
Mar. 31, 2011
The cost and fair value of available-for-sale and held-to-maturity securities by contractual maturity    
Available for sale securities amortized cost within 1 year $ 146,480,000  
Available-for-sale securities estimated fair value within 1 year 146,703,000  
Held-to-maturity securities amortized cost within 1 year 5,857,000  
Held-to-maturity securities estimated fair value within 1 year 5,857,000  
Available for sale securities amortized cost after 1 year through 5 years 89,429,000  
Available for sale securities estimated fair value after 1 year through 5 years 89,153,000  
Held-to-maturity securities amortized cost after 1 year through 5 years 0  
Held-to-maturity securities estimated fair value after 1 year through 5 years 0  
Available-for-sale securities amortized cost after 5 years through 10 years 5,793,000  
Available-for-sale securities estimated fair value after 5 years through 10 years 5,725,000  
Held-to-maturity securities amortized cost after 5 years through 10 years 0  
Held-to-maturity securities estimated fair value after 5 years through 10 years 0  
Available for sale securities amortized cost 241,702,000  
Available-for-sale securities estimated fair value 241,581,000  
Held-to-maturity securities amortized cost 5,857,000  
Held-to-maturity securities estimated fair value 5,857,000  
Investments (Textuals) [Abstract]    
Ownership percentage in Civitas Therapeutics, Inc. 11.00%  
Carrying value of equity investment in Civitas 1,200,000 1,300,000
Investment in a collaborative partner, Acceleron Pharma, Inc 8,500,000 8,500,000
Reduction in carrying value of deferred gain $ 100,000  

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