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2. REVENUE RECOGNITION (Details)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenue, Practical Expedient, Initial Application and Transition, Nondisclosure of Transaction Price Allocation to Remaining Performance Obligation [true false] true    
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true/false] true    
Warranty period 3 years    
SRAM products | Customer Concentration Risk      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Concentration risk percentage 98.00%    
Sales revenue goods | Customer Concentration Risk      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Concentration risk percentage 38.00% 45.00% 36.00%
Minimum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Payment terms 30 days    
Maximum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Payment terms 60 days