REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 6,461,387	$ 6,922,827	$ 18,725,380	$ 19,984,387
Point in time
Disaggregation of Revenue [Line Items]
Net sales	5,154,354	5,024,281	14,161,133	14,588,199
Over time
Disaggregation of Revenue [Line Items]
Net sales	1,307,033	1,898,546	4,564,247	5,396,188
HRS
Disaggregation of Revenue [Line Items]
Net sales	1,244,715	1,206,352	3,611,389	3,629,749
HRS | Point in time
Disaggregation of Revenue [Line Items]
Net sales	978,026	929,638	2,843,866	2,827,959
HRS | Over time
Disaggregation of Revenue [Line Items]
Net sales	266,689	276,714	767,523	801,790
IEI
Disaggregation of Revenue [Line Items]
Net sales	1,988,865	1,658,925	5,411,347	4,671,188
IEI | Point in time
Disaggregation of Revenue [Line Items]
Net sales	1,471,116	1,198,669	3,734,151	3,351,886
IEI | Over time
Disaggregation of Revenue [Line Items]
Net sales	517,749	460,256	1,677,196	1,319,302
CEC
Disaggregation of Revenue [Line Items]
Net sales	1,881,411	2,260,228	5,468,857	6,355,311
CEC | Point in time
Disaggregation of Revenue [Line Items]
Net sales	1,513,721	1,663,262	4,263,144	4,675,809
CEC | Over time
Disaggregation of Revenue [Line Items]
Net sales	367,690	596,966	1,205,713	1,679,502
CTG
Disaggregation of Revenue [Line Items]
Net sales	1,346,396	1,797,322	4,233,787	5,328,139
CTG | Point in time
Disaggregation of Revenue [Line Items]
Net sales	1,191,491	1,232,712	3,319,972	3,732,545
CTG | Over time
Disaggregation of Revenue [Line Items]
Net sales	$ 154,905	$ 564,610	$ 913,815	$ 1,595,594