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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating activities:    
Net income $ 3,758 $ 5,153
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property, equipment and improvements 2,551 2,483
Amortization of identifiable intangible assets 3,326 3,537
Stock-based compensation 2,906 2,798
Excess tax benefits from stock-based compensation (60) (133)
Deferred income tax benefit (1,397) (1,791)
Bad debt/product return provision 616 521
Inventory obsolescence 759 1,080
Restructuring 0 1,259
Other (109) (81)
Changes in operating assets and liabilities (net of acquisition) (4,242) (5,867)
Net cash provided by operating activities 8,108 8,959
Investing activities:    
Purchase of marketable securities (49,121) (64,234)
Proceeds from maturities of marketable securities 51,773 45,998
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 (2,415) (3,003)
Net cash used in investing activities (12,682) (21,104)
Financing activities:    
Excess tax benefits from stock-based compensation 60 133
Proceeds from stock option plan transactions 1,171 600
Proceeds from employee stock purchase plan transactions 740 811
Purchases of common stock (10,577) 0
Net cash (used in) provided by financing activities (8,606) 1,544
Effect of exchange rate changes on cash and cash equivalents (1,174) (1,869)
Net decrease in cash and cash equivalents (14,354) (12,470)
Cash and cash equivalents, beginning of period 60,246 54,684
Cash and cash equivalents, end of period 45,892 42,214
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Issuance of common stock for business acquisition (6,804) 0
Securities purchased, not settled $ (250) $ 0