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EXCEL - IDEA: XBRL DOCUMENT - ALKERMES INCFinancial_Report.xls
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v2.3.0.11
Investments (Details) (USD $)
In Thousands
Jun. 30, 2011
Mar. 31, 2011
Schedule of Marketable Securities [Line Items]    
Total investments, Amortized Cost $ 249,405 $ 257,151
Total investments, Gross Unrealized Gains 475 444
Total investments, Gross Unrealized Losses, Less than One Year (140) (927)
Total investments, Gross Unrealized Losses, Greater than One Year (307) (332)
Total investments, Estimated Fair Value 249,433 256,336
U.S. government and agency debt securities [Member] | Short-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 158,567 117,298
Available-for-sale Securities, Gross Unrealized Gains 128 129
Available-for-sale Securities, Gross Unrealized Losses, Less than One Year   (1)
Available-for-sale Securities, Estimated Fair Value 158,695 117,426
U.S. government and agency debt securities [Member] | Long-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 17,300 57,709
Available-for-sale Securities, Gross Unrealized Losses, Less than One Year (132) (804)
Available-for-sale Securities, Estimated Fair Value 17,168 56,905
International government agency debt securities [Member] | Short-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 25,657 23,048
Available-for-sale Securities, Gross Unrealized Gains 149 236
Available-for-sale Securities, Estimated Fair Value 25,806 23,284
International government agency debt securities [Member] | Long-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 6,121 15,281
Available-for-sale Securities, Gross Unrealized Losses, Less than One Year (8) (93)
Available-for-sale Securities, Estimated Fair Value 6,113 15,188
Corporate debt securities [Member] | Short-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 26,045 20,973
Available-for-sale Securities, Gross Unrealized Gains 49 48
Available-for-sale Securities, Gross Unrealized Losses, Greater than One Year (1) (4)
Available-for-sale Securities, Estimated Fair Value 26,093 21,017
Corporate debt securities [Member] | Long-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 8,012 15,140
Available-for-sale Securities, Gross Unrealized Losses, Less than One Year   (29)
Available-for-sale Securities, Gross Unrealized Losses, Greater than One Year (306) (328)
Available-for-sale Securities, Estimated Fair Value 7,706 14,783
Strategic investments [Member] | Long-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 644 644
Available-for-sale Securities, Gross Unrealized Gains 149 31
Available-for-sale Securities, Estimated Fair Value 793 675
Money market funds [Member] | Short-term Investments [Member]
   
Schedule of Marketable Securities [Line Items]    
Total investments, Amortized Cost 1,202 1,201
Total investments, Estimated Fair Value 1,202 1,201
Short-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 210,269 161,319
Available-for-sale Securities, Gross Unrealized Gains 326 413
Available-for-sale Securities, Gross Unrealized Losses, Less than One Year   (1)
Available-for-sale Securities, Gross Unrealized Losses, Greater than One Year (1) (4)
Available-for-sale Securities, Estimated Fair Value 210,594 161,727
Schedule of Marketable Securities [Line Items]    
Total investments, Amortized Cost 211,471 162,520
Total investments, Gross Unrealized Gains 326 413
Total investments, Gross Unrealized Losses, Less than One Year   (1)
Total investments, Gross Unrealized Losses, Greater than One Year   (4)
Total investments, Estimated Fair Value 211,796 162,928
Certificates of Deposit [Member] | Long-term Investments [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, Amortized Cost 5,440 5,440
Held-to-maturity securities, Estimated Fair Value 5,440 5,440
U.S. government obligations [Member] | Long-term Investments [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, Amortized Cost 417 417
Held-to-maturity securities, Estimated Fair Value 417 417
Long-term Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 32,077 88,774
Available-for-sale Securities, Gross Unrealized Gains 149 31
Available-for-sale Securities, Gross Unrealized Losses, Less than One Year (140) (926)
Available-for-sale Securities, Gross Unrealized Losses, Greater than One Year (306) (328)
Available-for-sale Securities, Estimated Fair Value 31,780 87,551
Schedule of Marketable Securities [Line Items]    
Total investments, Amortized Cost 37,934 94,631
Total investments, Gross Unrealized Gains 149 31
Total investments, Gross Unrealized Losses, Less than One Year (140) (926)
Total investments, Gross Unrealized Losses, Greater than One Year (306) (328)
Total investments, Estimated Fair Value 37,637 93,408
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, Amortized Cost 5,857 5,857
Held-to-maturity securities, Estimated Fair Value $ 5,857 $ 5,857