INCOME TAXES (Tables)

12 Months Ended

Mar. 31, 2013

INCOME TAXES

Schedule of components of company's provision (benefit) for income taxes

	Year Ended March 31,
(In thousands)	2013			2012			2011
Current income tax provision (benefit):
U.S. federal	$	8,152		$	7,321		$	(756	)
U.S. state		2,588			6,649			30
Rest of world		1,758			28			—
Deferred income tax (benefit) provision:
Ireland		(1,961	)		(4,551	)		—
U.S. federal		—			(10,024	)		(206	)
U.S. state		(79	)		(137	)		(19	)
Total tax provision (benefit)	$	10,458		$	(714	)	$	(951	)

Schedule of income (loss) before provision for income taxes by geographical area

	Year Ended March 31,
(In thousands)	2013			2012			2011
Ireland	$	(14,722	)	$	(36,711	)	$	—
U.S.		23,503			(84,858	)		(46,491	)
Rest of world		26,660			7,177			—
Income (loss) before provision for income taxes	$	35,441		$	(114,392	)	$	(46,491	)

Schedule of components of the company's net deferred tax liabilities

	March 31,
(In thousands)	2013			2012
Deferred tax assets:
Irish NOL carryforwards	$	55,842		$	55,176
Tax benefit from the exercise of stock options		8,437			22,089
Share-based compensation		23,468			21,992
Tax credit carryforwards		10,543			12,294
U.S. federal and state NOL carryforwards		496			1,516
Alkermes Europe, Ltd. NOL carryforward		—			4,675
Deferred revenue		1,682			1,778
Intangible assets		277			748
Property, plant and equipment		653			—
Bonus accrual		7,034			5,849
Other		9,150			9,774
Less: valuation allowance		(86,714	)		(107,128	)
Total deferred tax assets		30,868			28,763
Deferred tax liabilities:
Intangible assets		(40,968	)		(43,606	)
Property, plant and equipment		(19,607	)		(19,049	)
Other		(2,072	)		—
Total deferred tax liabilities		(62,647	)		(62,655	)
Net deferred tax liabilities	$	(31,779	)	$	(33,892	)

Schedule of current and non-current deferred tax assets (liabilities)

	Year Ended March 31,
(In thousands)	2013			2012
Current deferred tax assets	$	5,824		$	656
Current deferred tax liabilities		—			(36	)
Non-current deferred tax liabilities		(37,603	)		(34,512	)
Net deferred tax liabilities	$	(31,779	)	$	(33,892	)

Schedule of reconciliation of the company's federal statutory tax rate to its effective rate

	Year Ended March 31,
	2013			2012			2011
Statutory rate		12.5	%		12.5	%		34.0	%
U.S. state income taxes, net of U.S. federal benefit		4.7	%		(6.8	)%		—	%
R&D credit		—	%		—	%		1.4	%
Share-based compensation		3.3	%		(0.7	)%		(2.6	)%
Non-refundable withholding tax		4.7	%		—	%		—	%
Permanent items		(8.2	)%		—	%		(0.6	)%
Change in valuation allowance		(28.0	)%		47.3	%		(30.1	)%
Rate differential		40.5	%		(51.7	)%		—	%
Effective tax rate		29.5	%		0.6	%		2.1	%

Schedule of reconciliation of the beginning and ending amount of unrecognized tax benefits

(In thousands)	Unrecognized Tax Benefits
Balance, April 1, 2010	$	3,373
Additions based on tax positions related to prior periods		1,560
Balance, March 31, 2011		4,933
Additions based on tax positions related to prior periods		1,741
Decreases due to lapse of statute of limitations		(68	)
Balance, March 31, 2012		6,606
Additions based on tax positions related to prior periods		1,065
Decreases due to settlements with tax authorities		(413	)
Balance, March 31, 2013	$	7,258