Debtor's Financial Statements (Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash used in operating activities	$ (110,782)	$ (222,801)
Capital expenditures	(45,968)	(36,268)
Proceeds from asset sales	7,240	4,085
Net cash used in investing activities	(38,728)	(28,612)
Increase in other debt	127,336	270,915
Financing fees and other	(5,285)	(28,475)
Net cash provided by financing activities	121,699	230,248
Net decrease in cash and cash equivalents	(30,563)	(20,845)
Cash and cash equivalents, beginning of period	103,711	104,289
Cash and cash equivalents, end of period	73,148
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash used in operating activities	(104,048)	(217,406)
Capital expenditures	(15,398)	(14,410)
Proceeds from asset sales	14	12
Net cash used in investing activities	(15,384)	(14,398)
Increase in other debt	127,181	267,207
Financing fees and other	(5,164)	(28,475)
Net cash provided by financing activities	122,017	238,732
Net decrease in cash and cash equivalents	2,585	6,928
Cash and cash equivalents, beginning of period	17,349	26,419
Cash and cash equivalents, end of period	$ 19,934	$ 33,347