• Filing Date: 2020-06-24
  • Form Type: 10-K
  • Description: Annual report
v3.20.1
DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES Narrative (Details)
12 Months Ended
Mar. 31, 2020
USD ($)
region
segment
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Research and development $ 36,301,000 $ 32,113,000 $ 38,562,000
Advertising expense 3,400,000 4,500,000 8,900,000
Shipping and handling fees $ 9,400,000 9,100,000 10,300,000
Number of reportable segments | segment 1    
Number of geographic regions | region 3    
Employer contributions $ 0 $ 0 $ 800,000
Minimum      
Concentration Risk [Line Items]      
Product warranty term 1 year    
Maximum      
Concentration Risk [Line Items]      
Product warranty term 3 years    
Accounts Receivable | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk percentage 7.00% 21.00% 10.00%