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ALLOWANCE FOR CREDIT LOSSES: (Tables)
6 Months Ended
Sep. 30, 2021
Credit Loss [Abstract]  
Schedule of activity of the allowance for credit losses, returns and credits
The following table summarizes the Company's activity of allowance for credit losses, returns and credits (dollars in thousands):

Balance at beginning of periodAdditions charged to costs and expensesOther changesBad debts written off, net of amounts recoveredBalance at end of period
For the six months ended September 30, 2021
$7,617 $1,282 $(1)$(590)$8,308