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ALLOWANCE FOR DOUBTFUL ACCOUNTS:	3 Months Ended
ALLOWANCE FOR DOUBTFUL ACCOUNTS:	Jun. 30, 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 $5.2 million at June 30, 2018 and $6.8 million at March 31, 2018.