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Income Tax Benefit (Provision) - Components of Income Tax (Provision) Benefit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Current
Deferred	331,015	(20,318)	164,845	88,265
Total	$ 331,015	$ (20,318)	$ 164,845	$ 88,265

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.