Debtor Financial Statements - Debtor Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 83,444	$ 104,289	$ 74,281	$ 155,368
Accounts receivable, net	523,675	504,795
Inventories	511,124	488,221
Total current assets	60,684	33,316
Total current assets	1,190,150	1,142,091
Property, plant and equipment, net	577,121	558,115
Other noncurrent assets, total	68,399	51,049
Total assets	2,099,983	2,004,430
Current maturities of long-term debt	239,552	435,736
Accounts payable and accrued expenses	259,081	281,432
Total current liabilities	800,109	808,037
Liabilities	80,937	98,022
Liabilities not subject to compromise	1,085,126	1,850,498
Liabilities subject to compromise	964,225	0
Total Debtors' equity	50,632	153,932
Total liabilities and Debtors' equity	2,099,983	2,004,430
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	33,347	26,419
Accounts receivable, net	136,538
Inventories	53,610
Inventories	207,820
Total current assets	49,597
Total current assets	480,912
Property, plant and equipment, net	236,917
Investments in non-Debtor subsidiaries	403,645
Non-Debtor loans	258,660
Other noncurrent assets, total	108,061
Total other assets	770,366
Total assets	1,488,195
Current maturities of long-term debt	284,625
Accounts payable and accrued expenses	111,457
Total current liabilities	396,082
Liabilities	85,277
Liabilities not subject to compromise	481,359
Liabilities subject to compromise	964,225
Total Debtors' equity	42,611
Total liabilities and Debtors' equity	$ 1,488,195