INVENTORIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Inventory Disclosure [Abstract]
Raw materials	$ 53,103	$ 72,174
Work-in-process	887,686	805,642
Finished goods	41,617	42,104
Less: unliquidated progress payments	(164,450)	(138,206)
Total inventories	817,956	781,714
Inventory, Net, Government Contacts	63,570	80,201
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	$ 19,385