For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Receivables \| Janssen
Concentrations
Concentration risk percentage	32.00%	30.00%	75.00%
Receivables \| Acorda
Concentrations
Concentration risk percentage	15.00%	11.00%
Revenue \| Janssen
Concentrations
Concentration risk percentage	35.00%	48.00%	83.00%
Revenue \| Acorda
Concentrations
Concentration risk percentage	11.00%
Accounts receivable
Concentrations
Threshold percentage for disclosure of revenue and receivables	10.00%
Revenues, net
Concentrations
Threshold percentage for disclosure of revenue and receivables	10.00%