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

Amount before valuation reserves of merchandise or goods held by the entity that are readily available for sale and items held by the entity which are partially complete or in the process of being readied for sale.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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