SUMMARY OF ACCOUNTING POLICIES - Tangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Cash and Cash Equivalents
Cash and bank balances	$ 1,019,802	$ 763,834
Money market funds and time deposits	452,622	1,066,841
Cash and cash equivalents	1,472,424	1,830,675	$ 1,607,570	$ 1,628,408
Inventories
Raw materials	2,760,410	2,537,623
Work-in-progress	450,569	279,493
Finished goods	588,850	579,346
Inventories, total	3,799,829	3,396,462
Property, Plant and Equipment
Property and equipment, gross	5,497,469	5,727,006
Accumulated depreciation and amortization	(3,257,963)	(3,409,980)
Property and equipment, net	2,239,506	2,317,026
Depreciation expense associated with property and equipment	434,432	432,238	$ 425,729
Machinery and equipment
Property, Plant and Equipment
Property and equipment, gross	$ 3,004,707	3,233,392
Machinery and equipment | Minimum
Property, Plant and Equipment
Depreciable Life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Depreciable Life	10 years
Buildings
Property, Plant and Equipment
Depreciable Life	30 years
Property and equipment, gross	$ 1,154,881	1,237,739
Leasehold improvements
Property, Plant and Equipment
Property and equipment, gross	$ 414,917	395,663
Leasehold improvements | Maximum
Property, Plant and Equipment
Depreciable Life	30 years
Furniture, fixtures, computer equipment and software
Property, Plant and Equipment
Property and equipment, gross	$ 482,248	502,223
Furniture, fixtures, computer equipment and software | Minimum
Property, Plant and Equipment
Depreciable Life	3 years
Furniture, fixtures, computer equipment and software | Maximum
Property, Plant and Equipment
Depreciable Life	7 years
Land
Property, Plant and Equipment
Property and equipment, gross	$ 152,992	145,663
Construction-in-progress
Property, Plant and Equipment
Property and equipment, gross	$ 287,724	$ 212,326