13. EMPLOYEE BENEFIT PLANS (Details)	12 Months Ended
	Mar. 31, 2019
United States
Defined Contribution Plan Disclosure [Line Items]
Maximum amount employee can contribute (as a percent)	15.00%
Taiwan
Defined Contribution Plan Disclosure [Line Items]
Maximum amount employee can contribute (as a percent)	6.00%
Maximum amount employer can contribute (as a percent)	6.00%
Israel
Defined Contribution Plan Disclosure [Line Items]
Maximum amount employee can contribute (as a percent)	6.00%
Maximum amount employer can contribute (as a percent)	15.83%