INVENTORIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 86,216	$ 70,242
Work-in-process	1,081,650	966,889
Finished goods	98,655	75,960
Less: unliquidated progress payments	(138,763)	(124,128)
Total inventories	1,127,758	988,963
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	$ 129,870	$ 71,167