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Income Tax Benefit (Provision) - Components of Income Tax Benefit (Provision) (Detail) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Current	$ 0us-gaap_CurrentIncomeTaxExpenseBenefit	$ 0us-gaap_CurrentIncomeTaxExpenseBenefit	$ 0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred		164,845,000us-gaap_DeferredIncomeTaxExpenseBenefit	(56,262,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Total		$ 164,845,000us-gaap_IncomeTaxExpenseBenefit	$ (56,262,000)us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.