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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: - Accounts Receivable (Details) - Allowance for doubtful accounts, returns and credits - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance at beginning of period $ 3,182 $ 2,137 $ 3,282
Additions charged to costs and expenses 3,069 1,214 296
Other changes (92) 123 (30)
Bad debts written off, net of amounts recovered (3,152) (292) (1,411)
Balance at end of period $ 3,007 $ 3,182 $ 2,137