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INVESTMENTS - REALIZED GAINS AND LOSSES (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
INVESTMENTS
Proceeds from the sales and maturities of marketable securities	$ 493,520	$ 335,169
Realized gains	124	109
Realized losses	$ 28	$ 3

X

- Definition

Represents the profit realized on the sale of debt or equity securities categorized as held-to-maturity, trading securities and available-for-sale.

+ References

No definition available.

+ Details

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X

- Definition

Represents the loss realized on the sale of debt or equity securities categorized as held-to-maturity, trading securities and available-for-sale.

+ References

No definition available.

+ Details

Name:	alks_MarketableSecuritiesRealizedLoss
Namespace Prefix:	alks_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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