SEGMENT REPORTING - Geographic Information of Property, Plant and Equipment (Countries Accounting for More Than 10% of Net Property, Plant and Equipment) (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| Segment reporting information | ||
| Property and equipment, net | $ 2,336,213 | $ 2,239,506 |
| MEXICO | ||
| Segment reporting information | ||
| Property and equipment, net | 537,396 | 586,594 |
| China | ||
| Segment reporting information | ||
| Property and equipment, net | 523,124 | 491,664 |
| UNITED STATES | ||
| Segment reporting information | ||
| Property and equipment, net | $ 361,098 | $ 305,222 |
| Long Lived Assets | MEXICO | ||
| Segment reporting information | ||
| Concentration risk percentage | 23.00% | 26.00% |
| Long Lived Assets | China | ||
| Segment reporting information | ||
| Concentration risk percentage | 22.00% | 22.00% |
| Long Lived Assets | UNITED STATES | ||
| Segment reporting information | ||
| Concentration risk percentage | 15.00% | 14.00% |