ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: - Summary of the activity of the allowance for doubtful accounts, returns and credits (Details) - SEC Schedule, 12-09, Allowance, Credit Loss - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 7,575	$ 3,007	$ 3,182
Additions charged to costs and expenses	2,915	7,133	3,069
Other changes	108	86	(92)
Bad debts written off, net of amounts recovered	(2,981)	(2,651)	(3,152)
Balance at end of period	$ 7,617	$ 7,575	$ 3,007