Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net income	$ 5,153	$ 8,170
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	2,483	2,234
Amortization of identifiable intangible assets	3,537	4,874
Stock-based compensation	2,798	2,562
Excess tax benefits from stock-based compensation	(133)	(474)
Deferred income tax benefit	(1,791)	(883)
Bad debt/product return provision	521	45
Inventory obsolescence	1,080	1,439
Restructuring	1,259	(70)
Other	(81)	125
Changes in operating assets and liabilities	(5,867)	(1,854)
Net cash provided by operating activities	8,959	16,168
Investing activities:
Purchase of marketable securities	(64,234)	(44,517)
Proceeds from maturities of marketable securities	45,998	35,888
Proceeds from sale of investment	135	0
Purchase of property, equipment, improvements and certain other intangible assets	(3,003)	(2,166)
Net cash used in investing activities	(21,104)	(10,795)
Financing activities:
Excess tax benefits from stock-based compensation	133	474
Proceeds from stock option plan transactions	600	1,839
Proceeds from employee stock purchase plan transactions	811	744
Net cash provided by financing activities	1,544	3,057
Effect of exchange rate changes on cash and cash equivalents	(1,869)	569
Net (decrease) increase in cash and cash equivalents	(12,470)	8,999
Cash and cash equivalents, beginning of period	54,684	50,943
Cash and cash equivalents, end of period	$ 42,214	$ 59,942