INVENTORIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2017
Inventory [Line Items]
Raw materials	$ 81,989		$ 89,069
Work-in-process	1,100,660		1,297,989
Finished goods	124,744		118,265
Rotable Assets	51,952		57,337
Less: unliquidated progress payments	(123,155)		(222,485)
Total inventories	1,236,190		1,340,175
Inventory, Net, Government Contacts	27,635		34,392
Provision for Loss on Contracts	(307,934)		(172,416)
Loss on Contracts	131,400	$ 151,992
Bombardier [Member]
Inventory [Line Items]
Work-in-process	6,662		89,650
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	406,147		589,449
Provision for Loss on Contracts	(399,758)		(399,758)
Preproduction Costs Related to Long-term Supply Arrangements, Net	13,051		279,341
Embraer [Member]
Inventory [Line Items]
Work-in-process	5,139		14,987
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	146,765		173,169
Provision for Loss on Contracts	0		(5,800)
Preproduction Costs Related to Long-term Supply Arrangements, Net	151,904		182,356
Total Bombardier and Embraer [Member]
Inventory [Line Items]
Work-in-process	11,801		104,637
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	552,912		762,618
Provision for Loss on Contracts	(399,758)		(405,558)
Preproduction Costs Related to Long-term Supply Arrangements, Net	$ 164,955		$ 461,697