Inome Taxes (Income Tax Provision) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Current:
Federal	$ 0	$ 0	$ 0
State	473	76	53
Foreign	0	(8)	2
Total current income tax provision	473	68	55
Deferred:
Federal	7,465	(56,665)	0
State	1,795	(5,757)	0
Foreign	0	0	0
Total deferred tax provision (benefit)	9,260	(62,422)	0
Income tax provision (benefit)	$ 9,733	$ (62,354)	$ 55