SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Mar. 31, 2013

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of estimated useful life of property, plant and equipment

Asset group	Term
Buildings and improvements	15 - 40 years
Furniture, fixtures and equipment	3 - 10 years
Leasehold improvements	Shorter of useful life or lease term

Schedule of changes in the carrying amount of the company's asset retirement obligation

(In thousands)	Carrying Amount
Balance, April 1, 2011	$	1,692
Accretion expense		170
Balance, March 31, 2012	$	1,862
Accretion expense		187
Balance, March 31, 2013	$	2,049

Schedule of revenue and receivables from customers exceeding 10% of total in each category

	2013						2012						2011
Customer	Receivables			Revenue			Receivables			Revenue			Receivables			Revenue
Janssen		32	%		35	%		30	%		48	%		75	%		83	%
Acorda		15	%		11	%		11	%		—			—			—

Schedule of revenues by geographic location, as determined by the location of the customer, and the location of its long-term assets

	Year Ended March 31,
(In thousands)	2013		2012		2011
Revenue by region:
U.S.	$	380,565	$	212,859	$	76,700
Ireland		14,455		12,695		805
Rest of world		180,528		164,423		109,135
Assets by region:
Current assets:
U.S.	$	248,441	$	209,683	$	252,960
Ireland		159,544		122,077		—
Rest of world		603		7,393		—
Long-term assets:
U.S.	$	233,369	$	217,406	$	199,488
Ireland		828,334		878,658		—
Rest of world		—		—		—

Schedule of weighted-average assumptions

	Year Ended March 31,
	2013	2012	2011
Expected option term	5 - 7 years	5 - 7 years	5 - 7 years
Expected stock volatility	47% - 49%	47% - 51%	46% - 51%
Risk-free interest rate	0.61% - 1.18%	0.82% - 2.5%	1.11% - 3.42%
Expected annual dividend yield	—	—	—