SUMMARY OF ACCOUNTING POLICIES - Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Apr. 01, 2019	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2018
ASSETS
Contract assets		$ 216,202	$ 0	$ 0
Inventories		3,722,854		3,799,829
Other current assets		854,790		1,380,466
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other current liabilities		1,426,075		1,719,418
Other liabilities				531,587
Accumulated deficit		$ (3,012,012)		(3,144,114)
Calculated under Revenue Guidance in Effect before Topic 606
ASSETS
Contract assets			451,287
Inventories			3,352,077
Other current assets			1,328,987
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other current liabilities			1,631,521
Other liabilities			533,685
Accumulated deficit			(3,106,259)
Accounting Standards Update 2014-09 | Adjustment
ASSETS
Contract assets			451,287
Inventories			(447,752)
Other current assets			(51,479)
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other current liabilities			(87,897)
Other liabilities			2,098
Accumulated deficit			$ 37,855	$ 37,900
Subsequent Event | Calculated under Revenue Guidance in Effect before Topic 606
ASSETS
Contract assets	$ 0
Inventories	3,975,698
Other current assets	863,655
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other current liabilities	1,491,780
Accumulated deficit	(3,047,126)
Subsequent Event | Accounting Standards Update 2014-09 | Adjustment
ASSETS
Contract assets	(216,202)
Inventories	252,844
Other current assets	8,865
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other current liabilities	65,705
Accumulated deficit	$ (35,114)