ORGANIZATION OF THE COMPANY AND BASIS OF PRESENTATION - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 01, 2018	Mar. 31, 2018
ASSETS
Contract assets	$ 298,451	$ 0	$ 0
Inventories	3,897,891		3,799,829
Other current assets	930,376		1,380,466
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other current liabilities	1,527,276		1,719,418
Other liabilities	486,886		531,587
Accumulated deficit	(2,947,661)		(3,144,114)
Balance without ASC 606 Adoption
ASSETS
Contract assets	0	412,787
Inventories	4,213,671	3,390,577
Other current assets	940,420	1,328,987
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other current liabilities	1,578,570	1,631,521
Other liabilities		533,685
Accumulated deficit	(2,984,159)	$ (3,181,969)
Accounting Standards Update 2014-09 | Adjustments
ASSETS
Contract assets	(298,451)		412,787
Inventories	315,780		(409,252)
Other current assets	10,044		(51,479)
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other current liabilities	51,294		(87,897)
Other liabilities			2,098
Accumulated deficit	$ (36,498)		$ (37,855)