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ALLOWANCE FOR DOUBTFUL ACCOUNTS:
9 Months Ended
Dec. 31, 2018
Valuation and Qualifying Accounts [Abstract]  
ALLOWANCE FOR DOUBTFUL ACCOUNTS: ALLOWANCE FOR DOUBTFUL ACCOUNTS: Trade accounts receivable are presented net of allowances for doubtful accounts, returns and credits of $3.4 million at December 31, 2018 and $3.1 million at March 31, 2018.