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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities:    
Net income $ 3,603 $ 1,325
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property, equipment and improvements 2,170 2,694
Amortization of identifiable intangible assets 2,286 2,787
Stock-based compensation 3,262 3,160
Excess tax benefits from stock-based compensation 0 (44)
Deferred income tax provision (benefit) 1,729 (2,033)
Gain on insurance settlement related to property and equipment (1,375) 0
Bad debt/product return provision (recovery) 198 (196)
Inventory obsolescence 842 610
Restructuring charges, net 509 81
Other (81) (24)
Changes in operating assets and liabilities (4,147) (5,815)
Net cash provided by operating activities 8,996 2,545
Investing activities:    
Purchase of marketable securities (31,054) (15,574)
Proceeds from maturities of marketable securities 28,494 35,364
Proceeds from insurance settlement related to property and equipment 1,400 0
Proceeds from sale of property and equipment 45 0
Purchase of property, equipment, improvements and certain other intangible assets (3,888) (2,719)
Net cash (used in) provided by investing activities (5,003) 17,071
Financing activities:    
Excess tax benefits from stock-based compensation 0 44
Proceeds from stock option plan transactions 6,332 3,336
Proceeds from employee stock purchase plan transactions 708 770
Purchases of common stock (2,339) (9,651)
Net cash provided by (used in) financing activities 4,701 (5,501)
Effect of exchange rate changes on cash and cash equivalents (2,429) 482
Net increase in cash and cash equivalents 6,265 14,597
Cash and cash equivalents, beginning of period 47,490 41,320
Cash and cash equivalents, end of period $ 53,755 $ 55,917