Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Net income	$ 1,325	$ 3,758
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	2,694	2,551
Amortization of identifiable intangible assets	2,787	3,326
Stock-based compensation	3,160	2,906
Excess tax benefits from stock-based compensation	(44)	(60)
Deferred income tax benefit	(2,033)	(1,397)
Bad debt/product return (recovery) provision	(196)	616
Inventory obsolescence	610	759
Restructuring charges (reversal), net	81	(37)
Other	(24)	(109)
Changes in operating assets and liabilities (net of acquisition)	(5,815)	(4,205)
Net cash provided by operating activities	2,545	8,108
Investing activities:
Purchase of marketable securities	(15,574)	(49,121)
Proceeds from maturities of marketable securities	35,364	51,773
Acquisition of business, net of cash acquired	0	(12,919)
Purchase of property, equipment, improvements and certain other intangible assets	(2,719)	(2,415)
Net cash provided by (used in) investing activities	17,071	(12,682)
Financing activities:
Excess tax benefits from stock-based compensation	44	60
Proceeds from stock option plan transactions	3,336	1,171
Proceeds from employee stock purchase plan transactions	770	740
Purchases of common stock	(9,651)	(10,577)
Net cash used in financing activities	(5,501)	(8,606)
Effect of exchange rate changes on cash and cash equivalents	482	(1,174)
Net increase (decrease) in cash and cash equivalents	14,597	(14,354)
Cash and cash equivalents, beginning of period	41,320	60,246
Cash and cash equivalents, end of period	55,917	45,892
Supplemental schedule of non-cash investing activities:
Issuance of common stock for business acquisition	0	6,804
Securities purchased, not settled	$ 0	$ 250