CONTINGENCIES (Details) - USD ($) $ in Thousands		9 Months Ended
	Apr. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Product warranty accrual [Roll Forward]
Accrual balance at beginning of year		$ 2,518	$ 2,234
Accruals for product warranties		1,872	1,992
Cost of warranty claims		(1,897)	(1,872)
Accrual balance at end of period		2,493	$ 2,354
Standby Letters of Credit [Member] | Office Space - Burlington, Massachusetts [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued		1,300
Loss Contingency, Range Of Possible Loss, Portion Not Accrued, Minimum		1,200
Avid Technology Domestic [Member] | Standby Letters of Credit [Member]
Operating Lease Commitments [Abstract]
Letters of Credit Outstanding, Amount		1,100
Other Operating Obligations [Member] | Standby Letters of Credit [Member]
Operating Lease Commitments [Abstract]
Letters of Credit Outstanding, Amount		$ 1,200
Research and Development Arrangement [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	$ 12,800
Long-term Purchase Commitment, Period	3 years