Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
NET REVENUES	$ 51,480	$ 52,283
COST OF SALES	19,908	20,273
GROSS PROFIT	31,572	32,010
OPERATING EXPENSES
Research and development	3,967	4,420
Selling and marketing	7,563	8,844
General and administrative	8,902	9,202
Restructuring costs		734
Litigation costs	589	749
Total operating expenses	21,021	23,949
OPERATING INCOME	10,551	8,061
OTHER INCOME (EXPENSE)
Interest income	149	72
Interest expense	(363)	(395)
Other, net	139	(80)
Total other expense	(75)	(403)
EARNINGS BEFORE INCOME TAXES	10,476	7,658
INCOME TAX PROVISION	2,370	1,356
NET EARNINGS	$ 8,106	$ 6,302
BASIC EARNINGS PER COMMON SHARE	$ 0.19	$ 0.15
DILUTED EARNINGS PER COMMON SHARE	$ 0.19	$ 0.15
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING-BASIC	42,446	42,263
EFFECT OF DILUTIVE STOCK OPTIONS AND RESTRICTED SHARE UNITS	459	399
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING-DILUTED	42,905	42,662
ANTI-DILUTIVE SECURITIES:
Common share options and restricted share units	684	1,034
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.125	$ 0.125