SUMMARY OF ACCOUNTING POLICIES - Inventories (Details) - USD ($) $ in Thousands |
Mar. 31, 2019 |
Apr. 01, 2018 |
Mar. 31, 2018 |
|---|---|---|---|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Raw materials | $ 2,922,101 | $ 2,760,410 | |
| Work-in-progress | 366,135 | 450,569 | |
| Finished goods | 434,618 | 588,850 | |
| Inventories | 3,722,854 | $ 3,799,829 | |
| Accounting Standards Update 2014-09 | Adjustment | |||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Inventories | $ (447,752) | ||
| Work in process and finished goods | $ 252,800 |