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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Operating activities:      
Net income $ 9,958 $ 1,631 [1] $ 9,403 [1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation of property, equipment and improvements 4,578 3,349 [1] 2,968 [1]
Amortization of identifiable intangible assets 8,818 9,435 [1] 2,597 [1]
Stock-based compensation 5,655 4,854 [1] 4,659 [1]
Excess tax benefits from stock-based compensation 0 0 [1] (326) [1]
Deferred income tax benefit (799) (376) [1] (2,086) [1]
(Gain) loss on sale of property, equipment and improvements (4,392) (622) [1] 25 [1]
Change in fair value of contingent consideration 1,190 1,377 [1] (4,364) [1]
Provision for bad debt and product returns 635 1,120 [1] 361 [1]
Provision for inventory obsolescence 1,874 2,056 [1] 1,850 [1]
Other, net (156) 368 [1] 2,481 [1]
Changes in operating assets and liabilities (net of acquisitions):      
Accounts receivable (6,589) (16,004) [1] 833 [1]
Inventories (1,062) (11,344) [1] (4,904) [1]
Other assets (866) (1,412) [1] 562 [1]
Income taxes (103) 697 [1] (3) [1]
Accounts payable 8,232 2,728 [1] (3,536) [1]
Accrued expenses 1,991 (635) [1] (8,045) [1]
Net cash provided by (used in) operating activities 28,964 (2,778) [1] 2,475 [1]
Investing activities:      
Purchase of marketable securities 0 0 [1] (61,964) [1]
Proceeds from maturities of marketable securities 4,750 32,032 [1] 87,105 [1]
Proceeds from sale of business 0 2,000 [1] 3,000 [1]
Acquisition of businesses, net of cash acquired 0 (56,258) [1] (30,111) [1]
Proceeds from sale of property and equipment 10,096 731 [1] 0 [1]
Purchase of property, equipment, improvements and certain other intangible assets (9,335) (1,842) [1] (1,773) [1]
Net cash provided by (used in) investing activities 5,511 (23,337) [1] (3,743) [1]
Financing activities:      
Acquisition earn-out payments (3,748) 0 [1] (518) [1]
Excess tax benefits from stock-based compensation 0 0 [1] 326 [1]
Proceeds from stock option plan transactions 4,874 5,460 [1] 3,502 [1]
Proceeds from employee stock purchase plan transactions 1,058 1,115 [1] 685 [1]
Repurchase of common stock (1,071) (748) [1] (938) [1]
Net cash provided by financing activities 1,113 5,827 [1] 3,057 [1]
Effect of exchange rate changes on cash and cash equivalents (810) 80 [1] 706 [1]
Net increase (decrease) in cash and cash equivalents 34,778 (20,208) [1] 2,495 [1]
Cash and cash equivalents, beginning of period [1] 58,014 78,222 75,727
Cash and cash equivalents, end of period 92,792 58,014 [1] 78,222 [1]
Supplemental disclosures of cash flow information:      
Interest paid 1 10 [1] 1 [1]
Income taxes paid, net 2,048 1,235 [1] 2,129 [1]
Supplemental schedule of non-cash investing and financing activities:      
Accrual for capitalized intangible asset 0 (78) [1] (36) [1]
Transfer of inventory to property, equipment and improvements (1,064) (2,159) [1] (421) [1]
Liability related to acquisition of business $ 0 $ (2,300) [1] $ (1,310) [1]
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.