Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income	$ 724	$ 2,316
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	784	713
Amortization of identifiable intangible assets	1,245	1,697
Stock-based compensation	931	871
Excess tax benefits from stock-based compensation	(13)	(59)
Deferred income tax benefit	(583)	(584)
Bad debt/product return provision	323	90
Inventory obsolescence	476	201
Restructuring	236	(50)
Other	(274)	110
Changes in operating assets and liabilities	(3,607)	(557)
Net cash provided by operating activities	242	4,748
Investing activities:
Purchase of marketable securities	(22,789)	(2,174)
Proceeds from maturities of marketable securities	12,298	11,409
Proceeds from sale of investment	135
Purchase of property, equipment, improvements and certain other intangible assets	(1,624)	(721)
Net cash (used in) provided by investing activities	(11,980)	8,514
Financing activities:
Excess tax benefits from stock-based compensation	13	59
Proceeds from stock option plan transactions	150	443
Proceeds from employee stock purchase plan transactions	314	269
Net cash provided by financing activities	477	771
Effect of exchange rate changes on cash and cash equivalents	(855)	(770)
Net (decrease) increase in cash and cash equivalents	(12,116)	13,263
Cash and cash equivalents, beginning of period	54,684	50,943
Cash and cash equivalents, end of period	$ 42,568	$ 64,206