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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Net income $ 1,426 $ 2,230
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property, equipment and improvements 1,828 1,705
Amortization of identifiable intangible assets 1,891 2,204
Stock-based compensation 2,070 1,914
Excess tax benefits from stock-based compensation (44) (53)
Deferred income tax benefit (1,065) (1,079)
Bad debt/product return (recovery) provision (151) 285
Inventory obsolescence 409 554
Restructuring charges (reversal), net 81 (37)
Other 46 (307)
Changes in operating assets and liabilities (net of acquisition) (9,681) (4,066)
Net cash (used in) provided by operating activities (3,190) 3,350
Investing activities:    
Purchase of marketable securities (5,157) (37,337)
Proceeds from maturities of marketable securities 13,778 38,161
Acquisition of business, net of cash acquired 0 (12,919)
Purchase of property, equipment, improvements and certain other intangible assets (1,921) (2,080)
Net cash provided by (used in) investing activities 6,700 (14,175)
Financing activities:    
Excess tax benefits from stock-based compensation 44 53
Proceeds from stock option plan transactions 3,209 590
Proceeds from employee stock purchase plan transactions 561 248
Purchases of common stock (5,416) (6,765)
Net cash used in financing activities (1,602) (5,874)
Effect of exchange rate changes on cash and cash equivalents 329 (1,190)
Net increase (decrease) in cash and cash equivalents 2,237 (17,889)
Cash and cash equivalents, beginning of period 41,320 60,246
Cash and cash equivalents, end of period 43,557 42,357
Supplemental schedule of non-cash investing activities:    
Issuance of common stock for business acquisition $ 0 $ 6,804