Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
NET REVENUES	$ 47,160	$ 48,013
COST OF SALES	15,577	18,776
GROSS PROFIT	31,583	29,237
OPERATING EXPENSES
Research and development	3,381	3,103
Selling and marketing	6,443	6,080
General and administrative	8,173	7,385
Total operating expenses	17,997	16,568
OPERATING INCOME	13,586	12,669
OTHER INCOME (EXPENSE)
Interest income	17	6
Other, net	96	(582)
Total other income (expense)	113	(576)
EARNINGS BEFORE INCOME TAXES	13,699	12,093
INCOME TAX PROVISION	4,806	4,192
NET EARNINGS	$ 8,893	$ 7,901
BASIC EARNINGS PER COMMON SHARE	$ 0.21	$ 0.19
DILUTED EARNINGS PER COMMON SHARE	$ 0.21	$ 0.19
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING-BASIC	41,947	41,607
EFFECT OF DILUTIVE STOCK OPTIONS AND RESTRICTED SHARES AND UNITS	380	334
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING-DILUTED	42,327	41,941
ANTI-DILUTIVE SECURITIES:
Common share options and restricted shares and units	450	566
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.20	$ 0.20