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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities:    
Net income $ 2,230 $ 2,846
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property, equipment and improvements 1,705 1,606
Amortization of identifiable intangible assets 2,204 2,437
Stock-based compensation 1,914 1,886
Excess tax benefits from stock-based compensation (53) (67)
Deferred income tax benefit (1,079) (1,173)
Bad debt/product return provision 285 338
Inventory obsolescence 554 776
Restructuring 0 296
Other (307) (117)
Changes in operating assets and liabilities (net of acquisition) (4,103) (2,720)
Net cash provided by operating activities 3,350 6,108
Investing activities:    
Purchase of marketable securities (37,337) (41,640)
Proceeds from maturities of marketable securities 38,161 30,566
Proceeds from sale of investment 0 135
Acquisition of business, net of cash acquired 12,919 0
Purchase of property, equipment, improvements and certain other intangible assets (2,080) (2,650)
Net cash used in investing activities (14,175) (13,589)
Financing activities:    
Excess tax benefits from stock-based compensation 53 67
Proceeds from stock option plan transactions 590 521
Proceeds from employee stock purchase plan transactions 248 568
Purchase of treasury stock (6,765) 0
Net cash (used in) provided by financing activities (5,874) 1,156
Effect of exchange rate changes on cash and cash equivalents (1,190) (621)
Net decrease in cash and cash equivalents (17,889) (6,946)
Cash and cash equivalents, beginning of period 60,246 54,684
Cash and cash equivalents, end of period 42,357 47,738
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Issuance of common stock for business acquisition (6,804) 0
Securities purchased, not settled $ 0 $ (3,600)