SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Estimated Useful Lives of Depreciation and Amortization of the Principal Classes of Assets (Details)	3 Months Ended
	Jun. 30, 2019
Land [Member]
Estimated useful lives	Infinite
Property and buildings [Member]
Estimated useful lives	P15Y
Equipment and machinery [Member] | Maximum [Member]
Estimated useful lives	P-5Y
Equipment and machinery [Member] | Minimum [Member]
Estimated useful lives	P3Y
Office and electronic equipment [Member] | Maximum [Member]
Estimated useful lives	P-5Y
Office and electronic equipment [Member] | Minimum [Member]
Estimated useful lives	P3Y
Automobiles [Member]
Estimated useful lives	P5Y
Leasehold improvements [Member]
Estimated useful lives	Lesser of useful life and lease term