REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 6,720,000	$ 6,461,000	$ 17,858,000	$ 18,725,000
Point in time
Disaggregation of Revenue [Line Items]
Net sales	5,733,000	5,154,000	14,105,000	14,161,000
Over time
Disaggregation of Revenue [Line Items]
Net sales	987,000	1,307,000	3,753,000	4,564,000
FAS
Disaggregation of Revenue [Line Items]
Net sales	3,834,000	3,631,000	10,063,000	11,122,000
FAS | Point in time
Disaggregation of Revenue [Line Items]
Net sales	3,544,000	3,104,000	8,813,000	9,060,000
FAS | Over time
Disaggregation of Revenue [Line Items]
Net sales	290,000	527,000	1,250,000	2,062,000
FRS
Disaggregation of Revenue [Line Items]
Net sales	2,886,000	2,830,000	7,795,000	7,603,000
FRS | Point in time
Disaggregation of Revenue [Line Items]
Net sales	2,189,000	2,050,000	5,292,000	5,101,000
FRS | Over time
Disaggregation of Revenue [Line Items]
Net sales	$ 697,000	$ 780,000	$ 2,503,000	$ 2,502,000