MarineMax (HZO) 10-K 29 Nov 18 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2018	Nov. 26, 2018	Mar. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	HZO
Entity Registrant Name	MARINEMAX INC
Entity Central Index Key	1,057,060
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		27,282,316
Entity Public Float			$ 411,460,315

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 48,822	$ 41,952
Accounts receivable, net	34,003	24,661
Inventories, net	377,074	401,301
Prepaid expenses and other current assets	5,392	5,842
Total current assets	465,291	473,756
Property and equipment, net	138,716	127,160
Goodwill and other long-term assets, net	33,123	30,305
Deferred tax assets, net	3,408	8,769
Total assets	640,538	639,990
CURRENT LIABILITIES:
Accounts payable	23,134	26,432
Customer deposits	17,006	21,032
Accrued expenses	32,926	33,046
Short-term borrowings	212,949	254,177
Total current liabilities	286,015	334,687
Long-term liabilities	1,431	3,105
Total liabilities	287,446	337,792
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY:
Preferred stock, $.001 par value, 1,000,000 shares authorized, none issued or outstanding as of September 30, 2017 and 2018
Common stock, $.001 par value; 40,000,000 shares authorized, 26,314,066 and 27,141,267 shares issued and 21,887,579 and 22,670,536 shares outstanding as of September 30, 2017 and 2018, respectively	27	26
Additional paid-in capital	262,250	249,974
Retained earnings	166,071	126,759
Treasury stock, at cost, 4,426,487 and 4,470,731 shares held as of September 30, 2017 and 2018, respectively	(75,256)	(74,561)
Total shareholders' equity	353,092	302,198
Total liabilities and shareholders' equity	$ 640,538	$ 639,990

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2018	Sep. 30, 2017
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	27,141,267	26,314,066
Common stock, shares outstanding	22,670,536	21,887,579
Treasury stock, shares	4,470,731	4,426,487

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 1,177,371	$ 1,052,320	$ 942,050
Cost of sales	879,138	787,005	716,022
Gross profit	298,233	265,315	226,028
Selling, general, and administrative expenses	235,050	220,026	185,776
Income from operations	63,183	45,289	40,252
Interest expense	9,903	7,481	5,462
Income before income tax provision	53,280	37,808	34,790
Income tax provision	13,968	14,261	12,208
Net income	$ 39,312	$ 23,547	$ 22,582
Basic net income per common share	$ 1.77	$ 0.98	$ 0.93
Diluted net income per common share	$ 1.71	$ 0.95	$ 0.91
Weighted average number of common shares used in computing net income per common share:
Basic	22,269,378	23,966,611	24,203,947
Diluted	23,030,662	24,678,800	24,820,847

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Beginning Balance at Sep. 30, 2015	$ 283,645	$ 26	$ 234,478	$ 75,433	$ (26,292)
Beginning Balance, Shares at Sep. 30, 2015		25,562,994
Net income	22,582			22,582
Adjustment to adopt ASU 2016-09	5,197			5,197
Purchase of treasury stock	(5,531)				(5,531)
Shares issued pursuant to employee stock purchase plan	823		823
Shares issued pursuant to employee stock purchase plan, Shares		68,495
Shares issued upon vesting of equity awards, net of minimum tax withholding	(362)		(362)
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares		36,546
Shares issued upon exercise of stock options	1,878		1,878
Shares issued upon exercise of stock options, Shares		272,510
Stock-based compensation	4,241		4,241
Stock-based compensation, Shares		37,087
Ending Balance at Sep. 30, 2016	312,473	$ 26	241,058	103,212	(31,823)
Ending Balance, Shares at Sep. 30, 2016		25,977,632
Net income	23,547			23,547
Purchase of treasury stock	(42,738)				(42,738)
Shares issued pursuant to employee stock purchase plan	887		887
Shares issued pursuant to employee stock purchase plan, Shares		51,697
Shares issued upon vesting of equity awards, net of minimum tax withholding	(479)		(479)
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares		56,539
Shares issued upon exercise of stock options	2,271		2,271
Shares issued upon exercise of stock options, Shares		184,931
Stock-based compensation	6,237		6,237
Stock-based compensation, Shares		43,267
Ending Balance at Sep. 30, 2017	$ 302,198	$ 26	249,974	126,759	(74,561)
Ending Balance, Shares at Sep. 30, 2017	26,314,066	26,314,066
Net income	$ 39,312			39,312
Purchase of treasury stock	(695)				(695)
Shares issued pursuant to employee stock purchase plan	950		950
Shares issued pursuant to employee stock purchase plan, Shares		67,187
Shares issued upon vesting of equity awards, net of minimum tax withholding	(1,643)		(1,643)
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares		163,350
Shares issued upon exercise of stock options	6,733	$ 1	6,732
Shares issued upon exercise of stock options, Shares		586,531
Stock-based compensation	6,237		6,237
Stock-based compensation, Shares		10,133
Ending Balance at Sep. 30, 2018	$ 353,092	$ 27	$ 262,250	$ 166,071	$ (75,256)
Ending Balance, Shares at Sep. 30, 2018	27,141,267	27,141,267

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 39,312	$ 23,547	$ 22,582
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,673	9,364	7,964
Deferred income tax provision	5,361	12,306	11,639
Loss on sale of property and equipment and assets held for sale	330	306	51
Gain on insurance settlements	(1,082)
Proceeds from insurance settlements	2,342
Gain on contingent acquisition consideration	(1,440)
Stock-based compensation expense, net	6,237	6,237	4,241
(Increase) Decrease in —
Accounts receivable, net	(11,279)	266	(5,436)
Inventories, net	26,773	(57,107)	(32,417)
Prepaid expenses and other assets	(996)	(1,710)	(1,517)
(Decrease) Increase in —
Accounts payable	(3,325)	16,835	(4,278)
Customer deposits	(4,065)	(9,341)	16,625
Accrued expenses and long-term liabilities	1,573	4,042	3,409
Net cash provided by operating activities	70,414	4,745	22,863
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(13,804)	(14,367)	(12,913)
Proceeds from insurance settlements	823
Net cash used in acquisition of businesses	(10,524)	(18,725)	(17,062)
Proceeds from sale of property and equipment and assets held for sale	190	994	228
Net cash used in investing activities	(23,315)	(32,098)	(29,747)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings on short-term borrowings	(43,383)	70,819	15,768
Net proceeds from issuance of common stock under incentive compensation, and employee purchase plans	7,683	3,158	2,701
Contingent acquisition consideration payments	(3,324)	(150)
Payments on tax withholdings for equity awards	(510)	(369)	(80)
Purchase of treasury stock	(695)	(42,738)	(5,531)
Net cash provided by (used in) financing activities	(40,229)	30,720	12,858
NET INCREASE IN CASH AND CASH EQUIVALENTS:	6,870	3,367	5,974
CASH AND CASH EQUIVALENTS, beginning of period	41,952	38,585	32,611
CASH AND CASH EQUIVALENTS, end of period	48,822	41,952	38,585
Cash paid for:
Interest	12,021	8,482	6,002
Income taxes	9,424	457	855
Non-cash items:
Held for sale assets classified as property and equipment			3,800
Accrued tax withholdings upon vesting of equity awards	1,525	392	282
Contingent consideration liabilities from acquisitions		3,720	3,307
Adjustment to retained earnings and deferred tax assets to adopt ASU 2016-09			5,197
Accrued acquisition of property and equipment	$ 129	$ 300
Exchange of equity interest for controlling interest			$ 2,860

Company Background and Basis of

Company Background and Basis of Presentation	12 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Company Background and Basis of Presentation	1. COMPANY BACKGROUND AND BASIS OF PRESENTATION: We are the largest recreational boat and yacht retailer in the United States. We engage primarily in the retail sale, brokerage, and service of new and used boats, motors, trailers, marine parts and accessories and offer slip and storage accommodations in certain locations. In addition, we arrange related boat financing, insurance, and extended service contracts. We also offer the charter of power yachts in the British Virgin Islands. As of September 30, 2018, we operated through 63 retail locations in 16 states, consisting of Alabama, Connecticut, Florida, Georgia, Maryland, Massachusetts, Minnesota, Missouri, New Jersey, New York, North Carolina, Ohio, Oklahoma, Rhode Island, South Carolina, and Texas. Our MarineMax Vacations operations maintain a facility in Tortola, British Virgin Islands. We are the nation’s largest retailer of Sea Ray and Boston Whaler recreational boats and yachts which are manufactured by Brunswick Corporation (“Brunswick”). Sales of new Brunswick boats accounted for approximately 40% of our revenue in fiscal 2018. Sales of new Sea Ray and Boston Whaler boats, both divisions of Brunswick, accounted for approximately 21% and 17%, respectively, of our revenue in fiscal 2018. Brunswick is a world leading manufacturer of marine products and marine engines. We believe we represented approximately 42% of Brunswick’s Sea Ray boat sales, during our fiscal 2018. We have dealership agreements with Sea Ray, Boston Whaler, Harris, and Mercury Marine, all subsidiaries or divisions of Brunswick. We also have dealer agreements with Italy-based Azimut-Benetti Group’s product line for Azimut Yachts. These agreements allow us to purchase, stock, sell, and service these manufacturers’ boats and products. These agreements also allow us to use these manufacturers’ names, trade symbols, and intellectual properties in our operations. We have multi-year dealer agreements with Brunswick covering Sea Ray products that appoint us as the exclusive dealer of Sea Ray boats in our geographic markets. We are the exclusive dealer for Boston Whaler through multi-year dealer agreements for many of our geographic markets. In addition, we are the exclusive dealer for Azimut Yachts for the entire United States through a multi-year dealer agreement. Sales of new Azimut boats and yachts accounted for approximately 11% of our revenue in fiscal 2018. We believe non-Brunswick brands offer a migration for our existing customer base or fill a void in our product offerings, and accordingly, do not compete with the business generated from our other prominent brands. As is typical in the industry, we deal with most of our manufacturers, other than Sea Ray, Boston Whaler, and Azimut Yachts, under renewable annual dealer agreements, each of which gives us the right to sell various makes and models of boats within a given geographic region. Any change or termination of these agreements, or the agreements discussed above, for any reason, or changes in competitive, regulatory, or marketing practices, including rebate or incentive programs, could adversely affect our results of operations. Although there are a limited number of manufacturers of the type of boats and products that we sell, we believe that adequate alternative sources would be available to replace any manufacturer other than Sea Ray and Azimut as a product source. These alternative sources may not be available at the time of any interruption, and alternative products may not be available at comparable terms, which could affect operating results adversely. General economic conditions and consumer spending patterns can negatively impact our operating results. Unfavorable local, regional, national, or global economic developments or uncertainties regarding future economic prospects could reduce consumer spending in the markets we serve and adversely affect our business. Economic conditions in areas in which we operate dealerships, particularly Florida in which we generated approximately 55%, 55%, and 51% of our revenue during fiscal 2016, 2017, and 2018, respectively, can have a major impact on our operations. Local influences, such as corporate downsizing, military base closings, inclement weather such as Hurricane Sandy in 2012 or Hurricanes Harvey and Irma in 2017, environmental conditions, and specific events, such as the BP oil spill in the Gulf of Mexico in 2010, also could adversely affect, and in certain instances have adversely affected, our operations in certain markets. In an economic downturn, consumer discretionary spending levels generally decline, at times resulting in disproportionately large reductions in the sale of luxury goods. Consumer spending on luxury goods also may decline as a result of lower consumer confidence levels, even if prevailing economic conditions are favorable. As a result, an economic downturn could impact us more than certain of our competitors due to our strategic focus on a higher end of our market. Although we have expanded our operations during periods of stagnant or modestly declining industry trends, the cyclical nature of the recreational boating industry or the lack of industry growth may adversely affect our business, financial condition, and results of operations. Any period of adverse economic conditions or low consumer confidence has a negative effect on our business. Lower consumer spending resulting from a downturn in the housing market and other economic factors adversely affected our business in fiscal 2007, and continued weakness in consumer spending and depressed economic conditions had a substantial negative effect on our business and industry for several years after fiscal 2007. These conditions caused us to substantially reduce our acquisition program, delay new store openings, reduce our inventory purchases, engage in inventory reduction efforts, close a number of our retail locations, reduce our headcount, and amend and replace our credit facility. Acquisitions and new store openings remain important strategies to our company, and we plan to accelerate our growth through these strategies as industry conditions continue to improve. However, we cannot predict the length of unfavorable economic or industry conditions or the extent to which they could adversely affect our operating results nor can we predict the effectiveness of the measures we have taken to address unfavorable economic or industry conditions. In order to provide comparability between periods presented, certain amounts have been reclassified from the previously reported consolidated financial statements to conform to the consolidated financial statement presentation of the current period. The consolidated financial statements include our accounts and the accounts of our subsidiaries, all of which are wholly owned. All significant intercompany transactions and accounts have been eliminated.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Significant Accounting Policies	2. SIGNIFICANT ACCOUNTING POLICIES: Cash and Cash Equivalents We consider all highly liquid investments with an original maturity of three months or less to be cash equivalents. Vendor Consideration Received We account for consideration received from our vendors in accordance with FASB Accounting Standards Codification 605-50, “Revenue Recognition - Customer Payments and Incentives” (“ASC 605-50”). ASC 605-50 requires us to classify interest assistance received from manufacturers as a reduction of inventory cost and related cost of sales as opposed to netting the assistance against our interest expense incurred with our lenders. Pursuant to ASC 605-50, amounts received by us under our co-op assistance programs from our manufacturers are netted against related advertising expenses. Further pursuant to ASC 605-50, manufacturer incentives based upon cumulative volume of sales and purchases are recorded when the amounts are probable and reasonably estimable. Accounting for consideration received is not expected to materially change with the adoption of ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)”, in fiscal 2019. Inventories Inventory costs consist of the amount paid to acquire inventory, net of vendor consideration and purchase discounts, the cost of equipment added, reconditioning costs, and transportation costs relating to acquiring inventory for sale. We state new and used boat, motor, and trailer inventories at the lower of cost, determined on a specific-identification basis, or net realizable value. We state parts and accessories at the lower of cost, determined on an average cost basis, or net realizable value. We utilize our historical experience, the aging of the inventories, and our consideration of current market trends as the basis for determining a lower of cost or net realizable value valuation allowance. We do not believe there is a reasonable likelihood that there will be a change in the future estimates or assumptions we use to calculate our lower of cost or net realizable value valuation allowance which would result in a material effect on our operating results. As of September 30, 2017 and 2018, our lower of cost or net realizable value valuation allowance for new and used boat, motor, and trailer inventories was $1.8 million and $1.5 million, respectively. If events occur and market conditions change, causing the fair value to fall below carrying value, the lower of cost or net realizable value valuation allowance could increase. Property and Equipment We record property and equipment at cost, net of accumulated depreciation, and depreciate property and equipment over their estimated useful lives using the straight-line method. We capitalize and amortize leasehold improvements over the lesser of the life of the lease or the estimated useful life of the asset. Useful lives for purposes of computing depreciation are as follows: Years Buildings and improvements 5-40 Machinery and equipment 3-10 Furniture and fixtures 5-10 Vehicles 3-5 We remove the cost of property and equipment sold or retired and the related accumulated depreciation from the accounts at the time of disposition and include any resulting gain or loss in the consolidated statements of operations. We charge maintenance, repairs, and minor replacements to operations as incurred, and we capitalize and amortize major replacements and improvements over their useful lives. Goodwill We account for goodwill in accordance with FASB Accounting Standards Codification 350, “Intangibles - Goodwill and Other” (“ASC 350”), which provides that the excess of cost over net assets of businesses acquired is recorded as goodwill. In January 2017, we purchased Hall Marine Group, a privately owned boat dealer in the Southeast United States with locations in North Carolina, South Carolina, and Georgia, resulting in the recording of $16.0 million in goodwill. In January 2018, we purchased Island Marine Center, a privately owned boat dealer located in New Jersey resulting in the recording of $1.3 million in goodwill. In total, current and previous acquisitions have resulted in the recording of $27.4 million in goodwill. In accordance with ASC 350, we review goodwill for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Our annual impairment test is performed during the fourth fiscal quarter. If the carrying amount of goodwill exceeds its fair value we would recognize an impairment loss in accordance with ASC 350. As of September 30, 2018 , and based upon our most recent analysis, we determined through our qualitative assessment that it is not “more likely than not” that the fair values of our reporting units are less than their carrying values. As a result, we were not required to perform a quantitative goodwill impairment test . Impairment of Long-Lived Assets FASB Accounting Standards Codification 360-10-40, “Property, Plant, and Equipment - Impairment or Disposal of Long-Lived Assets” (“ASC 360-10-40”), requires that long-lived assets, such as property and equipment and purchased intangibles subject to amortization, be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of the asset is measured by comparison of its carrying amount to undiscounted future net cash flows the asset is expected to generate. If such assets are considered to be impaired, the impairment to be recognized is measured as the amount by which the carrying amount of the asset exceeds its fair market value. Estimates of expected future cash flows represent our best estimate based on currently available information and reasonable and supportable assumptions. Any impairment recognized in accordance with ASC 360-10-40 is permanent and may not be restored. The analysis is performed at a regional level for indicators of permanent impairment given the geographical interdependencies amongst our locations. Based upon our most recent analysis, we believe no further impairment of long-lived assets existed as of September 30, 2018. Customer Deposits Customer deposits primarily include amounts received from customers toward the purchase of boats. We recognize these deposits as revenue at the time of delivery or acceptance by the customers. Insurance We retain varying levels of risk relating to the insurance policies we maintain, most significantly workers’ compensation insurance and employee medical benefits. We are responsible for the claims and losses incurred under these programs, limited by per occurrence deductibles and paid claims or losses up to pre-determined maximum exposure limits. Our third-party insurance carriers pay any losses above the pre-determined exposure limits. We estimate our liability for incurred but not reported losses using our historical loss experience, our judgment, and industry information. Revenue Recognition We recognize revenue from boat, motor, and trailer sales, and parts and service operations at the time the boat, motor, trailer, or part is delivered to or accepted by the customer or the service is completed. We recognize deferred revenue from service operations and slip and storage services on a straight-line basis over the term of the contract as services are completed. We recognize commissions earned from a brokerage sale at the time the related brokerage transaction closes. We recognize income from the rentals of chartering power yachts on a straight-line basis over the term of the contract as services are completed. We recognize commissions earned by us for placing notes with financial institutions in connection with customer boat financing when we recognize the related boat sales. We recognize marketing fees earned on credit, life, accident, disability, gap, and hull insurance products sold by third-party insurance companies at the later of customer acceptance of the insurance product as evidenced by contract execution or when the related boat sale is recognized. Pursuant to negotiated agreements with financial and insurance institutions, we are charged back for a portion of these fees should the customer terminate or default on the related finance or insurance contract before it is outstanding for a stipulated minimum period of time. We base the chargeback allowance, which was not material to the consolidated financial statements taken as a whole as of September 30, 2018, on our experience with repayments or defaults on the related finance or insurance contracts. We also recognize commissions earned on extended warranty service contracts sold on behalf of third-party insurance companies at the later of customer acceptance of the service contract terms as evidenced by contract execution or recognition of the related boat sale. We are charged back for a portion of these commissions should the customer terminate or default on the service contract prior to its scheduled maturity. We determined the chargeback allowance, which was not material to the consolidated financial statements taken as a whole as of September 30, 2018, based upon our experience with terminations or defaults on the service contracts. The following table sets forth percentages of our revenue generated by certain products and services, for each of last three fiscal years. 2016 2017 2018 New boat sales 68.5 % 70.9 % 71.2 % Used boat sales 17.5 % 14.9 % 14.8 % Maintenance, repair, storage, and charter services 6.0 % 6.3 % 6.2 % Finance and insurance products 2.5 % 2.4 % 2.4 % Parts and accessories 3.5 % 3.6 % 3.6 % Brokerage sales 2.0 % 1.9 % 1.8 % Total revenue 100.0 % 100.0 % 100.0 % Stock-Based Compensation We account for our stock-based compensation plans following the provisions of FASB Accounting Standards Codification 718, “Compensation — Stock Compensation” (“ASC 718”). In accordance with ASC 718, we use the Black-Scholes valuation model for valuing all stock-based compensation and shares purchased under our Employee Stock Purchase Plan. We measure compensation for restricted stock awards and restricted stock units at fair value on the grant date based on the number of shares expected to vest and the quoted market price of our common stock. We recognize compensation cost for all awards in operations, net of estimated forfeitures, on a straight-line basis over the requisite service period for each separately vesting portion of the award. Advertising and Promotional Cost We expense advertising and promotional costs as incurred and include them in selling, general, and administrative expenses in the accompanying consolidated statements of operations. Pursuant to ASC 605-50, we net amounts received by us under our co-op assistance programs from our manufacturers against the related advertising expenses. Total advertising and promotional expenses approximated $13.5 million, $16.2 million, and $16.5 million, net of related co-op assistance of approximately $730,000, $779,000, and $653,000, for the fiscal years ended September 30, 2016, 2017, and 2018, respectively. Income Taxes We account for income taxes in accordance with FASB Accounting Standards Codification 740, “Income Taxes” (“ASC 740”). Under ASC 740, we recognize deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. We measure deferred tax assets and liabilities using enacted tax rates expected to apply to taxable income in the years in which we expect those temporary differences to be recovered or settled. We record valuation allowances to reduce our deferred tax assets to the amount expected to be realized by considering all available positive and negative evidence. Concentrations of Credit Risk Financial instruments, which potentially subject us to concentrations of credit risk, consist principally of cash and cash equivalents and accounts receivable. Concentrations of credit risk with respect to our cash and cash equivalents are limited primarily to amounts held with financial institutions. Concentrations of credit risk arising from our receivables are limited primarily to amounts due from manufacturers and financial institutions. Fair Value of Financial Instruments The carrying amount of our financial instruments approximates fair value resulting from either length to maturity or existence of interest rates that approximate prevailing market rates unless otherwise disclosed in these consolidated financial statements. Use of Estimates and Assumptions The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Significant estimates made by us in the accompanying consolidated financial statements relate to valuation allowances, valuation of goodwill and intangible assets, valuation of long-lived assets, valuation of contingent consideration, and valuation of accruals. Actual results could differ materially from those estimates. Segment Reporting We operate as one reporting segment in accordance with the FASB Accounting Standards Codification 280, “Segment Reporting”. The metrics used by our Chief Executive Officer (as the Company’s chief operating decision maker or the “CODM”) to assess the performance of the Company are focused on viewing the business as a single integrated business.

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
	Sep. 30, 2018
Accounting Changes And Error Corrections [Abstract]
New Accounting Pronouncements	3. NEW ACCOUNTING PRONOUNCEMENTS: In May 2014, the FASB issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”), a converged standard on revenue recognition. The new pronouncement requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also specifies the accounting for some costs to obtain or fulfill a contract with a customer, as well as enhanced disclosure requirements. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Early adoption is permitted for annual reporting periods beginning after December 15, 2016. While we have not completed the implementation process, we currently do not believe the adoption of this standard will have a material impact on our consolidated financial statements, or will cause a significant change to our current accounting policies or internal control over financial reporting for revenue recognition on boat, motor, and trailer sales, brokerage commissions, slip and storage services, charter rentals, yacht charter services, and fee income generated from finance and insurance products. However, the timing of revenue recognition for certain parts and service operations will be accelerated, as we have determined these performance obligations are satisfied over time under the new standard. We currently anticipate adopting the standard using the modified retrospective approach applied only to contracts not completed as of the date of adoption, with no restatement of comparative periods. We are finalizing our cumulative effect adjustment and currently expect that all changes to our revenue recognition methods as a result of adopting the new standard will result in a net, after-tax cumulative effect adjustment to increase retained earnings as of October 1, 2018 in the range of $200,000 to $800,000. We plan to adopt ASU 2014-09 in fiscal 2019. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). This update requires organizations to recognize lease assets and lease liabilities on the balance sheet and also disclose key information about leasing arrangements. ASU 2016-02 is effective for annual reporting periods beginning on or after December 15, 2018, and interim periods within those annual periods. Earlier application is permitted for all entities as of the beginning of an interim or annual period. While we are continuing to evaluate the impact of the adoption of ASU 2016-02 on our consolidated financial statements, we believe the adoption of ASU 2016-02 will have a significant and material impact to our consolidated balance sheet given our current lease agreements for our leased retail locations. We are continuing to evaluate the impact the adoption of ASU 2016-02 will have on our other consolidated financial statements. Based on our current assessment, we expect that most of our operating lease commitments will be subject to the new guidance and recognized as operating lease liabilities and right-of-use assets upon adoption, resulting in a material increase in the assets and liabilities recorded on our consolidated balance sheet. We expect to elect the majority of the standard’s available practical expedients on adoption In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment (Topic 350)” (“ASU 2017-04”). This update removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step 2 of the goodwill impairment test. As a result, under ASU 2017-04, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the impairment loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This guidance is effective prospectively for fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed after January 1, 2017. We elected to early adopt the new guidance in the fourth quarter of fiscal 2018.

Accounts Receivable

Accounts Receivable	12 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Accounts Receivable	4. ACCOUNTS RECEIVABLE: Trade receivables consist primarily of receivables from financial institutions, which provide funding for customer boat financing and amounts due from financial institutions earned from arranging financing with our customers. We normally collect these receivables within 30 days of the sale. Trade receivables also include amounts due from customers on the sale of boats, parts, service, and storage. Amounts due from manufacturers represent receivables for various manufacturer programs and parts and service work performed pursuant to the manufacturers’ warranties. The allowance for uncollectible receivables, which was not material to the consolidated financial statements as of September 30, 2017 or 2018, was based on our consideration of customer payment practices, past transaction history with customers, and economic conditions. When an account becomes uncollectable, we expense it as a bad debt and we credit payments subsequently received to the bad debt expense account. We review the allowance for uncollectible receivables when an event or other change in circumstances results in a change in the estimate of the ultimate collectability of a specific account. Accounts receivable, net consisted of the following as of September 30, 2017 2018 (Amounts in thousands) Trade receivables, net $ 15,860 $ 18,864 Amounts due from manufacturers 8,192 14,343 Other receivables 609 796 $ 24,661 $ 34,003

Inventories

Inventories	12 Months Ended
	Sep. 30, 2018
Inventory Disclosure [Abstract]
Inventories	5. INVENTORIES: Inventories, net, consisted of the following as of September 30, 2017 2018 (Amounts in thousands) New boats, motors, and trailers $ 357,957 $ 332,320 Used boats, motors, and trailers 35,211 35,999 Parts, accessories, and other 8,133 8,755 $ 401,301 $ 377,074

Property and Equipment

Property and Equipment	12 Months Ended
	Sep. 30, 2018
Property Plant And Equipment [Abstract]
Property and Equipment	6. PROPERTY AND EQUIPMENT: Property and equipment consisted of the following as of September 30, 2017 2018 (Amounts in thousands) Land $ 51,283 $ 56,628 Buildings and improvements 100,284 108,693 Machinery and equipment 33,278 32,155 Furniture and fixtures 3,938 3,925 Vehicles 7,862 9,328 196,645 210,729 Accumulated depreciation and amortization (69,485 ) (72,013 ) $ 127,160 $ 138,716 Depreciation and amortization expense on property and equipment totaled approximately $8.0 million, $9.4 million, and $10.7 million for the fiscal years ended September 30, 2016, 2017, and 2018, respectively.

Goodwill and Other Assets

Goodwill and Other Assets	12 Months Ended
	Sep. 30, 2018
Goodwill And Other Assets Disclosure [Abstract]
Goodwill and Other Assets	7. GOODWILL AND OTHER ASSETS: In total, current and previous acquisitions have resulted in the recording of $25.9 million and $27.4 million in goodwill as of September 30, 2017 and 2018, respectively. During February 2006, we became party to a joint venture with Brunswick that acquired certain real estate and assets of Great American Marina for an aggregate purchase price of approximately $11.0 million, of which we contributed approximately $4.0 million and Brunswick contributed approximately $7.0 million. The terms of the agreement specified that we were to operate and maintain the service business and that Brunswick was to operate and maintain the marina business. Simultaneously with the closing, the acquired entity became Gulfport Marina, LLC (“Gulfport”). We accounted for our investment in Gulfport in accordance with FASB Accounting Standards Codification 323, “Investment – Equity Method and Joint Venture”. Accordingly, we adjusted the carrying amount of our investment in Gulfport to recognize our share of earnings or losses, based on the service business we operated. During February 2016, we acquired Brunswick’s interest in the Gulfport joint venture. After the acquisition of Brunswick’s interest, we reported the complete operations of Gulfport in our consolidated balance sheet as of September 30, 2017 and 2018, and consolidated statement of operations for the remainder of fiscal year 2016, fiscal year 2017, and fiscal year 2018 subsequent to the acquisition in accordance with FASB Accounting Standards Codification 805, “Business Combinations”.

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Short-Term Borrowings	8. SHORT-TERM BORROWINGS: In October 2018, we amended and restated our Inventory Financing Agreement (the “Amended Credit Facility”), originally entered into in June 2010, as subsequently amended, with Wells Fargo Commercial Distribution Finance LLC (formerly GE Commercial Distribution Finance Corporation). The October 2018 amendment and restatement extended the maturity date of the Credit Facility to October 2021, and the Amended Credit Facility includes two additional one-year extension periods, with lender approval. The October 2018 amendment and restatement, among other things, modified the amount of borrowing availability and maturity date of the Credit Facility. The Amended Credit Facility provides a floor plan financing commitment of up to $400.0 million, an increase from the previous limit of $350.0 million, subject to borrowing base availability resulting from the amount and aging of our inventory. The Amended Credit Facility has certain financial covenants as specified in the agreement. The covenants include provisions that our leverage ratio must not exceed 2.75 to 1.0 and that our current ratio must be greater than 1.2 to 1.0. The interest rate for amounts outstanding under the Amended Credit Facility is 345 basis points above the one-month London Inter-Bank Offering Rate (“LIBOR”). There is an unused line fee of ten basis points on the unused portion of the Amended Credit Facility. Advances under the Amended Credit Facility are initiated by the acquisition of eligible new and used inventory or are re-advances against eligible new and used inventory that have been partially paid-off. Advances on new inventory will generally mature 1,080 days from the original invoice date. Advances on used inventory will mature 361 days from the date we acquire the used inventory. Each advance is subject to a curtailment schedule, which requires that we pay down the balance of each advance on a periodic basis starting after six months. The curtailment schedule varies based on the type and value of the inventory. The collateral for the Amended Credit Facility is primarily the Company’s inventory that is financed through the Amended Credit Facility and related accounts receivable. None of our real estate has been pledged for collateral for the Amended Credit Facility. The Amended Credit Facility contemplates that other lenders may be added by the Company to finance other inventory not financed under this Facility. As of September 30, 2017 and 2018, our indebtedness associated with financing our inventory and working capital needs totaled approximately $254.2 million and $212.9 million, respectively. As of September 30, 2017 and 2018, the interest rate on the outstanding short-term borrowings was approximately 4.7% and 5.5%, respectively. As of September 30, 2018, our additional available borrowings under our Amended Credit Facility were approximately $71.6 million based upon the outstanding borrowing base availability. As is common in our industry, we receive interest assistance directly from boat manufacturers, including Brunswick. The interest assistance programs vary by manufacturer, but generally include periods of free financing or reduced interest rate programs. The interest assistance may be paid directly to us or our lender depending on the arrangements the manufacturer has established. We classify interest assistance received from manufacturers as a reduction of inventory cost and related cost of sales as opposed to netting the assistance against our interest expense incurred with our lenders. The availability and costs of borrowed funds can adversely affect our ability to obtain adequate boat inventory and the holding costs of that inventory as well as the ability and willingness of our customers to finance boat purchases. As of September 30, 2018, we had no long-term debt. However, we rely on our Amended Credit Facility to purchase our inventory of boats. The aging of our inventory limits our borrowing capacity as defined curtailments reduce the allowable advance rate as our inventory ages. Our access to funds under our Amended Credit Facility also depends upon the ability of our lenders to meet their funding commitments, particularly if they experience shortages of capital or experience excessive volumes of borrowing requests from others during a short period of time. Unfavorable economic conditions, weak consumer spending, turmoil in the credit markets, and lender difficulties, among other potential reasons, could interfere with our ability to utilize our Amended Credit Facility to fund our operations. Any inability to utilize our Amended Credit Facility could require us to seek other sources of funding to repay amounts outstanding under the credit agreements or replace or supplement our credit agreements, which may not be possible at all or under commercially reasonable terms. Similarly, decreases in the availability of credit and increases in the cost of credit adversely affect the ability of our customers to purchase boats from us and thereby adversely affect our ability to sell our products and impact the profitability of our finance and insurance activities. Tight credit conditions during fiscal 2009, 2010, and 2011 adversely affected the ability of customers to finance boat purchases, which had a negative effect on our operating results.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	9. INCOME TAXES: The components of our provision (benefit) from income taxes consisted of the following for the fiscal years ended September 30, 2016 2017 2018 (Amounts in thousands) Current provision (benefit): Federal $ 496 $ 2,321 $ 8,055 State 73 (366 ) 195 Total current provision $ 569 $ 1,955 $ 8,250 Deferred provision (benefit): Federal 11,691 10,190 4,205 State (52 ) 2,116 1,513 Total deferred provision 11,639 12,306 5,718 Total income tax provision $ 12,208 $ 14,261 $ 13,968 During the fourth quarter of fiscal 2017, the Company recorded a net tax benefit of $1.8 million primarily pertaining to a worthless stock deduction. The tax benefit of this deduction was primarily based on the write-off of the Company’s investment in its British Virgin Islands subsidiary for US tax purposes. On December 22, 2017, the Tax Act was enacted which, among a number of its provisions, lowered the U.S. corporate tax rate from 35% to 21%, effective January 1, 2018. The Company's blended statutory tax rate for fiscal year 2018 will approximate 24.5% as a result of the change in statutory rates. For fiscal year 2018, we recorded a non-cash adjustment to income tax expense of $805,000 for the remeasurement of deferred taxes on the enactment date. Below is a reconciliation of the statutory federal income tax rate to our effective tax rate for the fiscal years ended September 30, 2016 2017 2018 Federal tax provision 35.0 % 35.0 % 24.5 % State taxes, net of federal effect 3.6 % 4.4 % 4.1 % Worthless stock deduction — (4.8 )% — Stock based compensation (0.5 )% 0.2 % (2.0 )% Valuation allowance (3.2 )% (0.1 )% (0.3 )% Foreign rate differential 0.5 % 2.4 % — Effect of Federal Tax Reform — — 1.5 % Other (0.3 )% 0.6 % (1.6 )% Effective tax rate 35.1 % 37.7 % 26.2 % Deferred income taxes reflect the impact of temporary differences between the amount of assets and liabilities recognized for financial reporting purposes and such amounts recognized for income tax purposes. The tax effects of these temporary differences representing the components of deferred tax assets as of September 30, 2017 2018 (Amounts in thousands) Deferred tax assets: Inventories $ 1,028 $ 588 Accrued expenses 521 644 Stock based compensation 4,121 2,258 Tax loss carryforwards 3,901 3,910 Other 593 580 Valuation allowance (246 ) (119 ) Total long-term deferred tax assets 9,918 7,861 Deferred tax liabilities: Depreciation and amortization (1,149 ) (4,453 ) Total long-term deferred tax liabilities $ (1,149 ) $ (4,453 ) Net deferred tax assets $ 8,769 $ 3,408 Pursuant to ASC 740, we must consider all positive and negative evidence regarding the realization of deferred tax assets. ASC 740 provides for four possible sources of taxable income to realize deferred tax assets: 1) taxable income in prior carryback years, 2) reversals of existing deferred tax liabilities, 3) tax planning strategies and 4) projected future taxable income. As of September 30, 2018, we have no available taxable income in prior carryback years, limited reversals of existing deferred tax liabilities or prudent and feasible tax planning strategies. Therefore, the recoverability of our deferred tax assets is dependent upon generating future taxable income. Since the fourth quarter of fiscal 2008, the Company had maintained a full valuation allowance against its deferred tax assets, having determined it was more likely than not that the deferred tax assets would not be realized. The determination of releasing valuation allowances against deferred tax assets is made, in part, pursuant to our assessment as to whether it is more likely than not that we will generate sufficient future taxable income against which benefits of the deferred tax assets may or may not be realized. Significant judgment is required in making estimates regarding our ability to generate income in future periods. In the fourth quarter of fiscal 2016, we reached the conclusion that it was appropriate to release the majority of our valuation allowance against our state net operating loss deferred tax assets due to our operating performance in fiscal 2016 being greater than projected at fiscal 2015 year end. We considered forecasts of future operating results and the utilization of net operating losses within the statutory mandated carryforward periods and determined it was more likely than not that the majority of our state net operating loss deferred tax assets would be realized. As a result of the release of a portion of our deferred tax asset valuation allowance, we recorded approximately $1.1 million reduction in our income tax provision. A portion of the valuation allowance was retained based on particular jurisdictions. Specifically, states with a shorter statutory carryforward periods and states where our economic presence, as defined by the jurisdiction’s tax laws, has been reduced. As of September 30, 2017, we no longer had federal net operating loss (NOL) carryforwards for federal income tax purposes. As of September 30, 2018, the Company has state NOL carryforwards of approximately $83.5 million for state income tax purposes, which resulted in a deferred tax asset of $3.9 million, and expire at various dates from 2029 through 2032. Significant judgment is also required in evaluating our uncertain tax positions. Although we believe our tax return positions are sustainable, we recognize tax benefits from uncertain tax positions in the financial statements only when it is more likely than not that the positions will not be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits and a consideration of the relevant taxing authority's administrative practices and precedents. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will impact the provision for income taxes in the period in which such determination is made. The provision for income taxes includes the impact of reserve provisions and changes to reserves that are considered appropriate, as well as the related net interest and penalties. In fiscal 2017, the Company released a reserve for an uncertain tax position based on administrative practice in the applicable jurisdiction in the amount of $264,000 of which approximately $177,000 impacted the effective tax rate. As of September 30, 2017 and 2018, we had approximately $0 of gross unrecognized tax benefits. The reconciliation of the total amount recorded for unrecognized tax benefits at the beginning and end of the fiscal years ended September 30, 2017 and 2018 is as follows: 2017 2018 (Amounts in thousands) Unrecognized tax benefits at the beginning of the year $ 254 $ - Increases in tax positions for prior years 10 - Decreases in tax positions for prior years (264 ) - Unrecognized tax benefits at the end of the year $ - $ - Consistent with our prior practices, we recognize interest and penalties related to uncertain tax positions as a component of income tax expense. As of September 30, 2017 and 2018, interest and penalties represented approximately $0 of the gross unrecognized tax benefits. We are subject to tax by both federal and state taxing authorities. Until the respective statutes of limitations expire, we are subject to income tax audits in the jurisdictions in which we operate. We are no longer subject to U.S. Federal tax assessments for fiscal years prior to 2014, and we are not subject to assessments prior to the 2013 fiscal year for the majority of the State jurisdictions.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Shareholders' Equity	10. SHAREHOLDERS’ EQUITY: In August 2017, our Board of Directors approved a new share repurchase plan allowing our company to repurchase up to 2,000,000 shares of our common stock through September 30, 2019. Under the plan, we may buy back common stock from time to time in the open market or in privately negotiated blocks, dependent upon various factors, including price and availability of the shares, and general market conditions. Through September 30, 2018 we had purchased an aggregate of 4,470,731 shares of common stock under the current and historical share repurchase plans for an aggregate purchase price of approximately $75.3 million. As of September 30, 2018, approximately 342,885 shares remained available for future purchases under the share repurchase program.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	11. STOCK-BASED COMPENSATION: We account for our stock-based compensation plans following the provisions of FASB Accounting Standards Codification 718, “Compensation — Stock Compensation” (“ASC 718”). In accordance with ASC 718, we use the Black-Scholes valuation model for valuing all stock-based compensation and shares purchased under our Employee Stock Purchase Plan. We measure compensation for restricted stock awards and restricted stock units at fair value on the grant date based on the number of shares expected to vest and the quoted market price of our common stock. We recognize compensation cost for all awards in operations, net of estimated forfeitures, on a straight-line basis over the requisite service period for each separately vesting portion of the award. Cash received from option exercises under all share-based compensation arrangements for the fiscal years ended September 30, 2016, 2017, and 2018 was approximately $2.7 million, $3.2 million, and $7.7 million, respectively. We currently expect to satisfy share-based awards with registered shares available to be issued.

The Incentive Stock Plans

The Incentive Stock Plans	12 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
The Incentive Stock Plans	12. THE INCENTIVE STOCK PLANS: During February 2017, our shareholders approved a proposal to amend the 2011 Stock-Based Compensation Plan (“2011 Plan”) to increase the 2,200,456 share threshold by 1,000,000 shares to 3,200,456 shares. During January 2011, our shareholders approved a proposal to authorize our 2011 Plan, which replaced our 2007 Incentive Compensation Plan (“2007 Plan”). Our 2011 Plan provides for the grant of stock options, stock appreciation rights, restricted stock, stock units, bonus stock, dividend equivalents, other stock related awards, and performance awards (collectively “awards”), that may be settled in cash, stock, or other property. Our 2011 Plan is designed to attract, motivate, retain, and reward our executives, employees, officers, directors, and independent contractors by providing such persons with annual and long-term performance incentives to expend their maximum efforts in the creation of stockholder value. Subsequent to the February 2013 and the February 2017 amendment described above, the total number of shares of our common stock that may be subject to awards under the 2011 Plan is equal to 3,000,000 shares, plus: (i) any shares available for issuance and not subject to an award under the 2007 Plan, which was 200,456 shares at the time of approval of the 2011 Plan; (ii) the number of shares with respect to which awards granted under the 2011 Plan and the 2007 Plan terminate without the issuance of the shares or where the shares are forfeited or repurchased; (iii) with respect to awards granted under the 2011 Plan and the 2007 Plan, the number of shares that are not issued as a result of the award being settled for cash or otherwise not issued in connection with the exercise or payment of the award; and (iv) the number of shares that are surrendered or withheld in payment of the exercise price of any award or any tax withholding requirements in connection with any award granted under the 2011 Plan or the 2007 Plan. The 2011 Plan terminates in January 2021, and awards may be granted at any time during the life of the 2011 Plan. The date on which awards vest are determined by the Board of Directors or the Plan Administrator. The Board of Directors has appointed the Compensation Committee as the Plan Administrator. The exercise prices of options are determined by the Board of Directors or the Plan Administrator and are at least equal to the fair market value of shares of common stock on the date of grant. The term of options under the 2011 Plan may not exceed ten years. The options granted have varying vesting periods. To date, we have not settled or been under any obligation to settle any awards in cash. The following table summarizes option activity from September 30, 2017 through September 30, 2018: Shares Available for Grant Options Outstanding Aggregate Intrinsic Value (in thousands) Weighted Average Exercise Price Weighted Average Remaining Contractual Life Balance as of September 30, 2017 1,386,561 1,207,504 $ 5,737 $ 11.81 5.3 Options granted (5,000 ) 5,000 — 18.95 Options cancelled/forfeited/expired 14,750 (14,750 ) — 12.27 Options exercised — (586,531 ) — 11.48 Restricted stock awards granted (341,517 ) — — — Restricted stock awards forfeited 61,925 — — — Additional shares of stock issued (69,472 ) — — — Balance as of September 30, 2018 1,047,247 611,223 $ 5,544 $ 12.18 4.4 Exercisable as of September 30, 2018 607,889 $ 5,537 $ 12.14 4.4 The weighted-average grant date fair value of options granted during the fiscal years ended September 30, 2016 and September 30, 2018 was $6.88 and $8.42, respectively. No options were granted during the fiscal year ended September 30, 2017. The total intrinsic value of options exercised during the fiscal years ended September 30, 2016, 2017, and 2018 was approximately $3.6 million, $1.6 million, and $6.3 million, respectively. As of September 30, 2017 and 2018, there were approximately $200,000 and $100,000, respectively, of unrecognized compensation costs related to non-vested options that are expected to be recognized over a weighted average period of 1.8 years. The total fair value of options vested during the fiscal years ended September 30, 2016, 2017, and 2018 was approximately $0.2 million, $2.5 million and $1.3 million, respectively. We used the Black-Scholes model to estimate the fair value of options granted. The expected term of options granted is derived from the output of the option pricing model and represents the period of time that options granted are expected to be outstanding. Volatility is based on the historical volatility of our common stock. The risk-free rate for periods within the contractual term of the options is based on the U.S. Treasury yield curve in effect at the time of grant. Below are the weighted-average assumptions used for the fiscal years ended September 30, 2016 and 2018. No options were granted for the fiscal year ended September 30, 2017. 2016 2017 2018 Dividend yield 0.0% — 0.0% Risk-free interest rate 1.0% — 2.7% Volatility 48.2% — 45.4% Expected life 5.0 years — 5.0 years

Employee Stock Purchase Plan

Employee Stock Purchase Plan	12 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Employee Stock Purchase Plan	13. EMPLOYEE STOCK PURCHASE PLAN: During February 2012, our shareholders approved a proposal to amend our 2008 Employee Stock Purchase Plan (“Stock Purchase Plan”) to increase the number of shares available under that plan by 500,000 shares. During February 2018, our Board of Directors approved a proposal to amend the Stock Purchase Plan to extend it such that the final annual offering will be in 2027. The Stock Purchase Plan as amended provides for up to 1,000,000 shares of common stock to be available for purchase by our regular employees who have completed at least one year of continuous service. In addition, there were 52,837 shares of common stock available under our 1998 Employee Stock Purchase Plan, which have been made available for issuance under our Stock Purchase Plan. The Stock Purchase Plan provides for implementation of up to 20 annual offerings beginning on the first day of October starting in 2008, with each offering terminating on September 30 of the following year. Each annual offering may be divided into two six-month offerings. For each offering, the purchase price per share will be the lower of (i) 85% of the closing price of the common stock on the first day of the offering or (ii) 85% of the closing price of the common stock on the last day of the offering. The purchase price is paid through periodic payroll deductions not to exceed 10% of the participant’s earnings during each offering period. However, no participant may purchase more than $25,000 worth of common stock annually. We used the Black-Scholes model to estimate the fair value of options granted to purchase shares issued pursuant to the Stock Purchase Plan. The expected term of options granted is derived from the output of the option pricing model and represents the period of time that options granted are expected to be outstanding. Volatility is based on the historical volatility of our common stock. The risk-free rate for periods within the contractual term of the options is based on the U.S. Treasury yield curve in effect at the time of grant. The following are the weighted-average assumptions used for the fiscal years ended September 30, 2016 2017 2018 Dividend yield 0.0% 0.0% 0.0% Risk-free interest rate 0.2% 0.7% 1.5% Volatility 50.9% 40.9% 49.9% Expected life Six months Six months Six months As of September 30, 2018, we had issued 860,535 shares of common stock under our Stock Purchase Plan.

Restricted Stock Awards

Restricted Stock Awards	12 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Restricted Stock Awards	14. RESTRICTED STOCK AWARDS: We have granted non-vested (restricted) stock awards (“restricted stock”) and restricted stock units (“RSUs”) to employees and Officers pursuant to the 2011 Plan and the 2007 Plan. The restricted stock awards and RSUs have varying vesting periods, but generally become fully vested between two and four years after the grant date, depending on the specific award, performance targets met for performance based awards granted to Officers, and vesting period for time based awards. Officer performance based awards are granted at the target amount of shares that may be earned and the actual amount of the award earned generally could range from 0% to 200% of the target number of shares based on the actual specified performance target met. We accounted for the restricted stock awards granted using the measurement and recognition provisions of ASC 718. Accordingly, the fair value of the restricted stock awards, including performance based awards, is measured on the grant date and recognized in earnings over the requisite service period for each separately vesting portion of the award. The following table summarizes restricted stock award activity from September 30, 2017 through September 30, 2018: Shares/ Units Weighted Average Grant Date Fair Value Non-vested balance as of September 30, 2017 606,543 $ 16.53 Changes during the period Awards granted 341,517 $ 20.13 Awards vested (181,809 ) $ 16.55 Awards forfeited (61,925 ) $ 17.15 Non-vested balance as of September 30, 2018 704,326 $ 17.61 As of September 30, 2018, we had approximately $6.3 million of total unrecognized compensation cost related to non-vested restricted stock awards. We expect to recognize that cost over a weighted-average period of 2.1 years.

Net Income Per Share

Net Income Per Share	12 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Net Income Per Share	15. NET INCOME PER SHARE: The following is a reconciliation of the shares used in the denominator for calculating basic and diluted net income per share for the fiscal years ended September 30, 2016 2017 2018 Weighted average common shares outstanding used in calculating basic income per share 24,203,947 23,966,611 22,269,378 Effect of dilutive options and non-vested restricted stock awards 616,900 712,189 761,284 Weighted average common and common equivalent shares used in calculating diluted income per share 24,820,847 24,678,800 23,030,662 During the fiscal years ended September 30, 2016, 2017, and 2018 there were 140,521, 18,526, and 1,288 weighted average shares of options outstanding, respectively, that were not included in the computation of diluted income per share because the options’ exercise prices were greater than the average market price of our common stock, and therefore, their effect would be anti-dilutive.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	16. COMMITMENTS AND CONTINGENCIES: Lease Commitments We lease certain land, buildings, wet slips, machinery, equipment, and vehicles related to our dealerships under non-cancelable third-party operating leases. Certain of our leases include options for renewal periods and provisions for escalation. Rental expenses, including month-to-month rentals, were approximately $7.1 million, $8.3 million, and $8.4 million for the fiscal years ended September 30, 2016, 2017, and 2018, respectively. Future minimum lease payments under non-cancelable operating leases as of September 30, 2018, were as follows: (Amounts in thousands) 2019 7,296 2020 7,077 2021 6,077 2022 4,961 2023 4,835 Thereafter 25,361 Total $ 55,607 Other Commitments and Contingencies We are party to various legal actions arising in the ordinary course of business. We believe that these matters should not have a material adverse effect on our consolidated financial condition, results of operations, or cash flows. In connection with certain of our workers’ compensation insurance policies, we maintain standby letters of credit for our insurance carriers in the amount of $1.4 million relating primarily to retained risk on our workers compensation claims. We are subject to federal and state environmental regulations, including rules relating to air and water pollution and the storage and disposal of gasoline, oil, other chemicals and waste. We believe that we are in compliance with such regulations.

Employee 401(k) Profit Sharing

Employee 401(k) Profit Sharing Plans	12 Months Ended
	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Employee 401(k) Profit Sharing Plans	17. EMPLOYEE 401(k) PROFIT SHARING PLANS: Employees are eligible to participate in our 401(k) Profit Sharing Plan (the “Plan”) following their 90-day introductory period starting either April 1 or October 1, provided that they are 21 years of age. Under the Plan, we matched 25% of participants’ contributions, up to a maximum of 5% of each participant’s compensation, in fiscal 2016 and 2017, and 50% of participants’ contributions, up to a maximum of 5% of each participant’s compensation in fiscal 2018. We contributed, under the Plan, or pursuant to previous similar plans, approximately $713,000, $765,000, and $1.9 million for the fiscal years ended September 30, 2016, 2017, and 2018, respectively.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	18. QUARTERLY FINANCIAL DATA (UNAUDITED): The following table sets forth certain unaudited quarterly financial data for each of our last eight quarters. The information has been derived from unaudited financial statements that we believe reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of such quarterly financial information. December 31, 2016 March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017 March 31, 2018 June 30, 2018 September 30, 2018 (Amounts in thousands except share and per share data) Revenue $ 226,875 $ 245,018 $ 329,809 $ 250,618 $ 236,921 $ 270,605 $ 361,254 $ 308,591 Cost of sales 173,737 183,959 245,017 184,292 177,672 201,312 270,567 229,587 Gross profit 53,138 61,059 84,792 66,326 59,249 69,293 90,687 79,004 Selling, general, and administrative expenses 47,095 54,781 59,557 58,593 50,246 58,659 64,089 62,056 Income from operations 6,043 6,278 25,235 7,733 9,003 10,634 26,598 16,948 Interest expense 1,569 2,045 1,897 1,970 2,542 2,840 2,499 2,022 Income before income income tax provision 4,474 4,233 23,338 5,763 6,461 7,794 24,099 14,926 Income tax provision 1,831 1,484 9,094 1,852 2,249 1,610 6,723 3,386 Net income $ 2,643 $ 2,749 $ 14,244 $ 3,911 $ 4,212 $ 6,184 $ 17,376 $ 11,540 Net income per share: Diluted $ 0.11 $ 0.11 $ 0.57 $ 0.17 $ 0.19 $ 0.27 $ 0.75 $ 0.50 Weighted average number of shares: Diluted 24,923,125 25,116,359 25,095,398 23,591,854 22,712,648 22,940,594 23,182,546 23,286,206

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with an original maturity of three months or less to be cash equivalents.
Vendor Consideration Received	Vendor Consideration Received We account for consideration received from our vendors in accordance with FASB Accounting Standards Codification 605-50, “Revenue Recognition - Customer Payments and Incentives” (“ASC 605-50”). ASC 605-50 requires us to classify interest assistance received from manufacturers as a reduction of inventory cost and related cost of sales as opposed to netting the assistance against our interest expense incurred with our lenders. Pursuant to ASC 605-50, amounts received by us under our co-op assistance programs from our manufacturers are netted against related advertising expenses. Further pursuant to ASC 605-50, manufacturer incentives based upon cumulative volume of sales and purchases are recorded when the amounts are probable and reasonably estimable. Accounting for consideration received is not expected to materially change with the adoption of ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)”, in fiscal 2019.
Inventories	Inventories Inventory costs consist of the amount paid to acquire inventory, net of vendor consideration and purchase discounts, the cost of equipment added, reconditioning costs, and transportation costs relating to acquiring inventory for sale. We state new and used boat, motor, and trailer inventories at the lower of cost, determined on a specific-identification basis, or net realizable value. We state parts and accessories at the lower of cost, determined on an average cost basis, or net realizable value. We utilize our historical experience, the aging of the inventories, and our consideration of current market trends as the basis for determining a lower of cost or net realizable value valuation allowance. We do not believe there is a reasonable likelihood that there will be a change in the future estimates or assumptions we use to calculate our lower of cost or net realizable value valuation allowance which would result in a material effect on our operating results. As of September 30, 2017 and 2018, our lower of cost or net realizable value valuation allowance for new and used boat, motor, and trailer inventories was $1.8 million and $1.5 million, respectively. If events occur and market conditions change, causing the fair value to fall below carrying value, the lower of cost or net realizable value valuation allowance could increase.
Property and Equipment	Property and Equipment We record property and equipment at cost, net of accumulated depreciation, and depreciate property and equipment over their estimated useful lives using the straight-line method. We capitalize and amortize leasehold improvements over the lesser of the life of the lease or the estimated useful life of the asset. Useful lives for purposes of computing depreciation are as follows: Years Buildings and improvements 5-40 Machinery and equipment 3-10 Furniture and fixtures 5-10 Vehicles 3-5 We remove the cost of property and equipment sold or retired and the related accumulated depreciation from the accounts at the time of disposition and include any resulting gain or loss in the consolidated statements of operations. We charge maintenance, repairs, and minor replacements to operations as incurred, and we capitalize and amortize major replacements and improvements over their useful lives.
Goodwill	Goodwill We account for goodwill in accordance with FASB Accounting Standards Codification 350, “Intangibles - Goodwill and Other” (“ASC 350”), which provides that the excess of cost over net assets of businesses acquired is recorded as goodwill. In January 2017, we purchased Hall Marine Group, a privately owned boat dealer in the Southeast United States with locations in North Carolina, South Carolina, and Georgia, resulting in the recording of $16.0 million in goodwill. In January 2018, we purchased Island Marine Center, a privately owned boat dealer located in New Jersey resulting in the recording of $1.3 million in goodwill. In total, current and previous acquisitions have resulted in the recording of $27.4 million in goodwill. In accordance with ASC 350, we review goodwill for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Our annual impairment test is performed during the fourth fiscal quarter. If the carrying amount of goodwill exceeds its fair value we would recognize an impairment loss in accordance with ASC 350. As of September 30, 2018 , and based upon our most recent analysis, we determined through our qualitative assessment that it is not “more likely than not” that the fair values of our reporting units are less than their carrying values. As a result, we were not required to perform a quantitative goodwill impairment test .
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets FASB Accounting Standards Codification 360-10-40, “Property, Plant, and Equipment - Impairment or Disposal of Long-Lived Assets” (“ASC 360-10-40”), requires that long-lived assets, such as property and equipment and purchased intangibles subject to amortization, be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of the asset is measured by comparison of its carrying amount to undiscounted future net cash flows the asset is expected to generate. If such assets are considered to be impaired, the impairment to be recognized is measured as the amount by which the carrying amount of the asset exceeds its fair market value. Estimates of expected future cash flows represent our best estimate based on currently available information and reasonable and supportable assumptions. Any impairment recognized in accordance with ASC 360-10-40 is permanent and may not be restored. The analysis is performed at a regional level for indicators of permanent impairment given the geographical interdependencies amongst our locations. Based upon our most recent analysis, we believe no further impairment of long-lived assets existed as of September 30, 2018.
Customer Deposits	Customer Deposits Customer deposits primarily include amounts received from customers toward the purchase of boats. We recognize these deposits as revenue at the time of delivery or acceptance by the customers.
Insurance	Insurance We retain varying levels of risk relating to the insurance policies we maintain, most significantly workers’ compensation insurance and employee medical benefits. We are responsible for the claims and losses incurred under these programs, limited by per occurrence deductibles and paid claims or losses up to pre-determined maximum exposure limits. Our third-party insurance carriers pay any losses above the pre-determined exposure limits. We estimate our liability for incurred but not reported losses using our historical loss experience, our judgment, and industry information.
Revenue Recognition	Revenue Recognition We recognize revenue from boat, motor, and trailer sales, and parts and service operations at the time the boat, motor, trailer, or part is delivered to or accepted by the customer or the service is completed. We recognize deferred revenue from service operations and slip and storage services on a straight-line basis over the term of the contract as services are completed. We recognize commissions earned from a brokerage sale at the time the related brokerage transaction closes. We recognize income from the rentals of chartering power yachts on a straight-line basis over the term of the contract as services are completed. We recognize commissions earned by us for placing notes with financial institutions in connection with customer boat financing when we recognize the related boat sales. We recognize marketing fees earned on credit, life, accident, disability, gap, and hull insurance products sold by third-party insurance companies at the later of customer acceptance of the insurance product as evidenced by contract execution or when the related boat sale is recognized. Pursuant to negotiated agreements with financial and insurance institutions, we are charged back for a portion of these fees should the customer terminate or default on the related finance or insurance contract before it is outstanding for a stipulated minimum period of time. We base the chargeback allowance, which was not material to the consolidated financial statements taken as a whole as of September 30, 2018, on our experience with repayments or defaults on the related finance or insurance contracts. We also recognize commissions earned on extended warranty service contracts sold on behalf of third-party insurance companies at the later of customer acceptance of the service contract terms as evidenced by contract execution or recognition of the related boat sale. We are charged back for a portion of these commissions should the customer terminate or default on the service contract prior to its scheduled maturity. We determined the chargeback allowance, which was not material to the consolidated financial statements taken as a whole as of September 30, 2018, based upon our experience with terminations or defaults on the service contracts. The following table sets forth percentages of our revenue generated by certain products and services, for each of last three fiscal years. 2016 2017 2018 New boat sales 68.5 % 70.9 % 71.2 % Used boat sales 17.5 % 14.9 % 14.8 % Maintenance, repair, storage, and charter services 6.0 % 6.3 % 6.2 % Finance and insurance products 2.5 % 2.4 % 2.4 % Parts and accessories 3.5 % 3.6 % 3.6 % Brokerage sales 2.0 % 1.9 % 1.8 % Total revenue 100.0 % 100.0 % 100.0 %
Stock-Based Compensation	Stock-Based Compensation We account for our stock-based compensation plans following the provisions of FASB Accounting Standards Codification 718, “Compensation — Stock Compensation” (“ASC 718”). In accordance with ASC 718, we use the Black-Scholes valuation model for valuing all stock-based compensation and shares purchased under our Employee Stock Purchase Plan. We measure compensation for restricted stock awards and restricted stock units at fair value on the grant date based on the number of shares expected to vest and the quoted market price of our common stock. We recognize compensation cost for all awards in operations, net of estimated forfeitures, on a straight-line basis over the requisite service period for each separately vesting portion of the award.
Advertising and Promotional Costs	Advertising and Promotional Cost We expense advertising and promotional costs as incurred and include them in selling, general, and administrative expenses in the accompanying consolidated statements of operations. Pursuant to ASC 605-50, we net amounts received by us under our co-op assistance programs from our manufacturers against the related advertising expenses. Total advertising and promotional expenses approximated $13.5 million, $16.2 million, and $16.5 million, net of related co-op assistance of approximately $730,000, $779,000, and $653,000, for the fiscal years ended September 30, 2016, 2017, and 2018, respectively.
Income Taxes	Income Taxes We account for income taxes in accordance with FASB Accounting Standards Codification 740, “Income Taxes” (“ASC 740”). Under ASC 740, we recognize deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. We measure deferred tax assets and liabilities using enacted tax rates expected to apply to taxable income in the years in which we expect those temporary differences to be recovered or settled. We record valuation allowances to reduce our deferred tax assets to the amount expected to be realized by considering all available positive and negative evidence.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments, which potentially subject us to concentrations of credit risk, consist principally of cash and cash equivalents and accounts receivable. Concentrations of credit risk with respect to our cash and cash equivalents are limited primarily to amounts held with financial institutions. Concentrations of credit risk arising from our receivables are limited primarily to amounts due from manufacturers and financial institutions.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amount of our financial instruments approximates fair value resulting from either length to maturity or existence of interest rates that approximate prevailing market rates unless otherwise disclosed in these consolidated financial statements.
Use of Estimates and Assumptions	Use of Estimates and Assumptions The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Significant estimates made by us in the accompanying consolidated financial statements relate to valuation allowances, valuation of goodwill and intangible assets, valuation of long-lived assets, valuation of contingent consideration, and valuation of accruals. Actual results could differ materially from those estimates.
Segment Reporting	Segment Reporting We operate as one reporting segment in accordance with the FASB Accounting Standards Codification 280, “Segment Reporting”. The metrics used by our Chief Executive Officer (as the Company’s chief operating decision maker or the “CODM”) to assess the performance of the Company are focused on viewing the business as a single integrated business.
New Accounting Pronouncements	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”), a converged standard on revenue recognition. The new pronouncement requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also specifies the accounting for some costs to obtain or fulfill a contract with a customer, as well as enhanced disclosure requirements. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Early adoption is permitted for annual reporting periods beginning after December 15, 2016. While we have not completed the implementation process, we currently do not believe the adoption of this standard will have a material impact on our consolidated financial statements, or will cause a significant change to our current accounting policies or internal control over financial reporting for revenue recognition on boat, motor, and trailer sales, brokerage commissions, slip and storage services, charter rentals, yacht charter services, and fee income generated from finance and insurance products. However, the timing of revenue recognition for certain parts and service operations will be accelerated, as we have determined these performance obligations are satisfied over time under the new standard. We currently anticipate adopting the standard using the modified retrospective approach applied only to contracts not completed as of the date of adoption, with no restatement of comparative periods. We are finalizing our cumulative effect adjustment and currently expect that all changes to our revenue recognition methods as a result of adopting the new standard will result in a net, after-tax cumulative effect adjustment to increase retained earnings as of October 1, 2018 in the range of $200,000 to $800,000. We plan to adopt ASU 2014-09 in fiscal 2019. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”). This update requires organizations to recognize lease assets and lease liabilities on the balance sheet and also disclose key information about leasing arrangements. ASU 2016-02 is effective for annual reporting periods beginning on or after December 15, 2018, and interim periods within those annual periods. Earlier application is permitted for all entities as of the beginning of an interim or annual period. While we are continuing to evaluate the impact of the adoption of ASU 2016-02 on our consolidated financial statements, we believe the adoption of ASU 2016-02 will have a significant and material impact to our consolidated balance sheet given our current lease agreements for our leased retail locations. We are continuing to evaluate the impact the adoption of ASU 2016-02 will have on our other consolidated financial statements. Based on our current assessment, we expect that most of our operating lease commitments will be subject to the new guidance and recognized as operating lease liabilities and right-of-use assets upon adoption, resulting in a material increase in the assets and liabilities recorded on our consolidated balance sheet. We expect to elect the majority of the standard’s available practical expedients on adoption In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment (Topic 350)” (“ASU 2017-04”). This update removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step 2 of the goodwill impairment test. As a result, under ASU 2017-04, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the impairment loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This guidance is effective prospectively for fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed after January 1, 2017. We elected to early adopt the new guidance in the fourth quarter of fiscal 2018.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2018
Estimated Life of Property and Equipment	Useful lives for purposes of computing depreciation are as follows: Years Buildings and improvements 5-40 Machinery and equipment 3-10 Furniture and fixtures 5-10 Vehicles 3-5
Product Concentration Risk [Member] | Sales [Member]
Summary of Percentages of Revenue Generated by Products and Services	The following table sets forth percentages of our revenue generated by certain products and services, for each of last three fiscal years. 2016 2017 2018 New boat sales 68.5 % 70.9 % 71.2 % Used boat sales 17.5 % 14.9 % 14.8 % Maintenance, repair, storage, and charter services 6.0 % 6.3 % 6.2 % Finance and insurance products 2.5 % 2.4 % 2.4 % Parts and accessories 3.5 % 3.6 % 3.6 % Brokerage sales 2.0 % 1.9 % 1.8 % Total revenue 100.0 % 100.0 % 100.0 %

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Accounts Receivable, Net	Accounts receivable, net consisted of the following as of September 30, 2017 2018 (Amounts in thousands) Trade receivables, net $ 15,860 $ 18,864 Amounts due from manufacturers 8,192 14,343 Other receivables 609 796 $ 24,661 $ 34,003

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Sep. 30, 2018
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories, net, consisted of the following as of September 30, 2017 2018 (Amounts in thousands) New boats, motors, and trailers $ 357,957 $ 332,320 Used boats, motors, and trailers 35,211 35,999 Parts, accessories, and other 8,133 8,755 $ 401,301 $ 377,074

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Sep. 30, 2018
Property Plant And Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment consisted of the following as of September 30, 2017 2018 (Amounts in thousands) Land $ 51,283 $ 56,628 Buildings and improvements 100,284 108,693 Machinery and equipment 33,278 32,155 Furniture and fixtures 3,938 3,925 Vehicles 7,862 9,328 196,645 210,729 Accumulated depreciation and amortization (69,485 ) (72,013 ) $ 127,160 $ 138,716

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Components of Income Taxes Provision (Benefit)	The components of our provision (benefit) from income taxes consisted of the following for the fiscal years ended September 30, 2016 2017 2018 (Amounts in thousands) Current provision (benefit): Federal $ 496 $ 2,321 $ 8,055 State 73 (366 ) 195 Total current provision $ 569 $ 1,955 $ 8,250 Deferred provision (benefit): Federal 11,691 10,190 4,205 State (52 ) 2,116 1,513 Total deferred provision 11,639 12,306 5,718 Total income tax provision $ 12,208 $ 14,261 $ 13,968
Summary of Tax Rates	Below is a reconciliation of the statutory federal income tax rate to our effective tax rate for the fiscal years ended September 30, 2016 2017 2018 Federal tax provision 35.0 % 35.0 % 24.5 % State taxes, net of federal effect 3.6 % 4.4 % 4.1 % Worthless stock deduction — (4.8 )% — Stock based compensation (0.5 )% 0.2 % (2.0 )% Valuation allowance (3.2 )% (0.1 )% (0.3 )% Foreign rate differential 0.5 % 2.4 % — Effect of Federal Tax Reform — — 1.5 % Other (0.3 )% 0.6 % (1.6 )% Effective tax rate 35.1 % 37.7 % 26.2 %
Components of Deferred Tax Assets	Deferred income taxes reflect the impact of temporary differences between the amount of assets and liabilities recognized for financial reporting purposes and such amounts recognized for income tax purposes. The tax effects of these temporary differences representing the components of deferred tax assets as of September 30, 2017 2018 (Amounts in thousands) Deferred tax assets: Inventories $ 1,028 $ 588 Accrued expenses 521 644 Stock based compensation 4,121 2,258 Tax loss carryforwards 3,901 3,910 Other 593 580 Valuation allowance (246 ) (119 ) Total long-term deferred tax assets 9,918 7,861 Deferred tax liabilities: Depreciation and amortization (1,149 ) (4,453 ) Total long-term deferred tax liabilities $ (1,149 ) $ (4,453 ) Net deferred tax assets $ 8,769 $ 3,408
Summary of Reconciliation of Unrecognized Tax Benefits	The reconciliation of the total amount recorded for unrecognized tax benefits at the beginning and end of the fiscal years ended September 30, 2017 and 2018 is as follows: 2017 2018 (Amounts in thousands) Unrecognized tax benefits at the beginning of the year $ 254 $ - Increases in tax positions for prior years 10 - Decreases in tax positions for prior years (264 ) - Unrecognized tax benefits at the end of the year $ - $ -

The Incentive Stock Plans (Tabl

The Incentive Stock Plans (Tables)	12 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Incentive Stock Plans Option Activity	The following table summarizes option activity from September 30, 2017 through September 30, 2018: Shares Available for Grant Options Outstanding Aggregate Intrinsic Value (in thousands) Weighted Average Exercise Price Weighted Average Remaining Contractual Life Balance as of September 30, 2017 1,386,561 1,207,504 $ 5,737 $ 11.81 5.3 Options granted (5,000 ) 5,000 — 18.95 Options cancelled/forfeited/expired 14,750 (14,750 ) — 12.27 Options exercised — (586,531 ) — 11.48 Restricted stock awards granted (341,517 ) — — — Restricted stock awards forfeited 61,925 — — — Additional shares of stock issued (69,472 ) — — — Balance as of September 30, 2018 1,047,247 611,223 $ 5,544 $ 12.18 4.4 Exercisable as of September 30, 2018 607,889 $ 5,537 $ 12.14 4.4
Weighted Average Assumptions of Incentive Stock Plans	Below are the weighted-average assumptions used for the fiscal years ended September 30, 2016 and 2018. No options were granted for the fiscal year ended September 30, 2017. 2016 2017 2018 Dividend yield 0.0% — 0.0% Risk-free interest rate 1.0% — 2.7% Volatility 48.2% — 45.4% Expected life 5.0 years — 5.0 years

Employee Stock Purchase Plan (T

Employee Stock Purchase Plan (Tables)	12 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted Average Assumptions of Employee Stock Purchase Plan	The following are the weighted-average assumptions used for the fiscal years ended September 30, 2016 2017 2018 Dividend yield 0.0% 0.0% 0.0% Risk-free interest rate 0.2% 0.7% 1.5% Volatility 50.9% 40.9% 49.9% Expected life Six months Six months Six months

Restricted Stock Awards (Tables

Restricted Stock Awards (Tables)	12 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Restricted Stock Award Activity	The following table summarizes restricted stock award activity from September 30, 2017 through September 30, 2018: Shares/ Units Weighted Average Grant Date Fair Value Non-vested balance as of September 30, 2017 606,543 $ 16.53 Changes during the period Awards granted 341,517 $ 20.13 Awards vested (181,809 ) $ 16.55 Awards forfeited (61,925 ) $ 17.15 Non-vested balance as of September 30, 2018 704,326 $ 17.61

Net Income Per Share (Tables)

Net Income Per Share (Tables)	12 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Basic and Diluted Net Income Per Share	The following is a reconciliation of the shares used in the denominator for calculating basic and diluted net income per share for the fiscal years ended September 30, 2016 2017 2018 Weighted average common shares outstanding used in calculating basic income per share 24,203,947 23,966,611 22,269,378 Effect of dilutive options and non-vested restricted stock awards 616,900 712,189 761,284 Weighted average common and common equivalent shares used in calculating diluted income per share 24,820,847 24,678,800 23,030,662

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Summary of Future Minimum Lease Payments Under Non-cancelable Operating Leases	Future minimum lease payments under non-cancelable operating leases as of September 30, 2018, were as follows: (Amounts in thousands) 2019 7,296 2020 7,077 2021 6,077 2022 4,961 2023 4,835 Thereafter 25,361 Total $ 55,607

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Financial Information	The following table sets forth certain unaudited quarterly financial data for each of our last eight quarters. The information has been derived from unaudited financial statements that we believe reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of such quarterly financial information. December 31, 2016 March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017 March 31, 2018 June 30, 2018 September 30, 2018 (Amounts in thousands except share and per share data) Revenue $ 226,875 $ 245,018 $ 329,809 $ 250,618 $ 236,921 $ 270,605 $ 361,254 $ 308,591 Cost of sales 173,737 183,959 245,017 184,292 177,672 201,312 270,567 229,587 Gross profit 53,138 61,059 84,792 66,326 59,249 69,293 90,687 79,004 Selling, general, and administrative expenses 47,095 54,781 59,557 58,593 50,246 58,659 64,089 62,056 Income from operations 6,043 6,278 25,235 7,733 9,003 10,634 26,598 16,948 Interest expense 1,569 2,045 1,897 1,970 2,542 2,840 2,499 2,022 Income before income income tax provision 4,474 4,233 23,338 5,763 6,461 7,794 24,099 14,926 Income tax provision 1,831 1,484 9,094 1,852 2,249 1,610 6,723 3,386 Net income $ 2,643 $ 2,749 $ 14,244 $ 3,911 $ 4,212 $ 6,184 $ 17,376 $ 11,540 Net income per share: Diluted $ 0.11 $ 0.11 $ 0.57 $ 0.17 $ 0.19 $ 0.27 $ 0.75 $ 0.50 Weighted average number of shares: Diluted 24,923,125 25,116,359 25,095,398 23,591,854 22,712,648 22,940,594 23,182,546 23,286,206

Company Background and Basis _2

Company Background and Basis of Presentation - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2018StoreState	Sep. 30, 2017	Sep. 30, 2016
Concentration Risk [Line Items]
Number of retail locations | Store	63
Number of states wherein retail locations are established | State	16
Product Concentration Risk [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	100.00%	100.00%	100.00%
Product Concentration Risk [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	40.00%
Product Concentration Risk [Member] | Brunswick Sea Ray Boat [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	21.00%
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	17.00%
Product Concentration Risk [Member] | Azimut Benetti Groups and Yachts | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	11.00%
Supplier Concentration Risk [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	42.00%
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	51.00%	55.00%	55.00%

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2018USD ($)Segment	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Jan. 31, 2018USD ($)	Jan. 31, 2017USD ($)
Significant Accounting Policies [Line Items]
Inventories valuation allowance, net realizable value	$ 1,500,000	$ 1,800,000
Goodwill	27,400,000	25,900,000
Impairment charges	0
Total advertising and promotional expenses	16,500,000	16,200,000	$ 13,500,000
Net of related co-op assistance	$ 653,000	$ 779,000	$ 730,000
Number of reporting segment | Segment	1
Hall Marine Group [Member]
Significant Accounting Policies [Line Items]
Goodwill					$ 16,000,000
Island Marine Center [Member]
Significant Accounting Policies [Line Items]
Goodwill				$ 1,300,000

Significant Accounting Polici_5

Significant Accounting Policies - Estimated Life of Property and Equipment (Detail)	12 Months Ended
	Sep. 30, 2018
Buildings and Improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	5 years
Buildings and Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	40 years
Machinery and Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	10 years
Furniture and Fixtures [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	10 years
Vehicles [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	3 years
Vehicles [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	5 years

Significant Accounting Polici_6

Significant Accounting Policies - Summary of Percentages of Revenue Generated by Products and Services (Detail) - Product Concentration Risk [Member] - Sales [Member]	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	100.00%	100.00%	100.00%
New Boat Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	71.20%	70.90%	68.50%
Used Boat Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	14.80%	14.90%	17.50%
Maintenance, Repair, Storage and Charter Services [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	6.20%	6.30%	6.00%
Finance and Insurance Products [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	2.40%	2.40%	2.50%
Parts and Accessories [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.60%	3.60%	3.50%
Brokerage Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	1.80%	1.90%	2.00%

New Accounting Pronouncements -

New Accounting Pronouncements - Additional Information (Detail) - USD ($)	Oct. 01, 2018	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect adjustment to increase retained earnings, net of tax as a result of adopting new standard		$ 166,071,000	$ 126,759,000
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect adjustment to increase retained earnings, net of tax as a result of adopting new standard	$ 200,000
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect adjustment to increase retained earnings, net of tax as a result of adopting new standard	$ 800,000

Accounts Receivable - Additiona

Accounts Receivable - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Receivable Collection Period	30 days

Accounts Receivable - Accounts

Accounts Receivable - Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Receivables [Abstract]
Trade receivables, net	$ 18,864	$ 15,860
Amounts due from manufacturers	14,343	8,192
Other receivables	796	609
Accounts receivable, net	$ 34,003	$ 24,661

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Inventory [Line Items]
Inventories, net	$ 377,074	$ 401,301
New Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories, net	332,320	357,957
Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories, net	35,999	35,211
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories, net	$ 8,755	$ 8,133

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 210,729	$ 196,645
Accumulated depreciation and amortization	(72,013)	(69,485)
Property and equipment, net	138,716	127,160
Land [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	56,628	51,283
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	108,693	100,284
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	32,155	33,278
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	3,925	3,938
Vehicles [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 9,328	$ 7,862

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Property Plant And Equipment [Abstract]
Depreciation and amortization	$ 10,673	$ 9,364	$ 7,964

Goodwill and Other Assets - Add

Goodwill and Other Assets - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Feb. 28, 2006	Sep. 30, 2018	Sep. 30, 2017
Schedule Of Goodwill And Other Assets [Line Items]
Goodwill		$ 27.4	$ 25.9
Corporate Joint Venture [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Acquired certain real estate and assets	$ 4
Great American Marina [Member] | Corporate Joint Venture [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Acquired certain real estate and assets	11
Brunswick's Contribution [Member] | Corporate Joint Venture [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Acquired certain real estate and assets	$ 7

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Oct. 31, 2018	May 31, 2017
Line Of Credit Facility [Line Items]
Additional borrowings	$ 71,600,000
Long-term debt	$ 0
Minimum [Member]
Line Of Credit Facility [Line Items]
Current ratio	1.20%
Borrowing Base Amount and Aging Inventory [Member]
Line Of Credit Facility [Line Items]
Inventory and working capital needs	$ 212,900,000	$ 254,200,000
Interest rate on short-term borrowings	5.50%	4.70%
Amended Credit Facility [Member]
Line Of Credit Facility [Line Items]
Additional extension for two one-year periods	Oct. 31, 2021
Interest rate for amounts outstanding under the Amended Credit Facility	3.45%
Amended Credit Facility [Member] | Borrowing Base Amount and Aging Inventory [Member]
Line Of Credit Facility [Line Items]
Amount of borrowing availability				$ 350,000,000
Line of Credit Facility, Description	The October 2018 amendment and restatement extended the maturity date of the Credit Facility to October 2021, and the Amended Credit Facility includes two additional one-year extension periods, with lender approval.
Leverage ratio	2.75%
Credit Facility interest rate description	The interest rate for amounts outstanding under the Amended Credit Facility is 345 basis points above the one-month London Inter-Bank Offering Rate (“LIBOR”).
Debt instrument, covenant compliance	The covenants include provisions that our leverage ratio must not exceed 2.75 to 1.0 and that our current ratio must be greater than 1.2 to 1.0.
Unused line fee on the unused portion of the amended Credit Facility	0.10%
Advances on new inventory mature date	1080 days
Advances on used inventory maturity period	361 days
Advance is subject to a curtailment schedule, periodic basis	6 months
Real estate property pledged for collateral	$ 0
Amended Credit Facility [Member] | Borrowing Base Amount and Aging Inventory [Member] | Subsequent Event [Member]
Line Of Credit Facility [Line Items]
Amount of borrowing availability			$ 400,000,000

Income Taxes - Components of In

Income Taxes - Components of Income Taxes Provision (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Current provision (benefit):
Federal									$ 8,055	$ 2,321	$ 496
State									195	(366)	73
Total current provision									8,250	1,955	569
Deferred provision (benefit):
Federal									4,205	10,190	11,691
State									1,513	2,116	(52)
Total deferred provision									5,718	12,306	11,639
Total income tax provision	$ 3,386	$ 6,723	$ 1,610	$ 2,249	$ 1,852	$ 9,094	$ 1,484	$ 1,831	$ 13,968	$ 14,261	$ 12,208

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended									9 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Net tax benefit	$ (3,386,000)	$ (6,723,000)	$ (1,610,000)	$ (2,249,000)	$ (1,852,000)	$ (9,094,000)	$ (1,484,000)	$ (1,831,000)			$ (13,968,000)	$ (14,261,000)	$ (12,208,000)
Federal corporate tax rate				35.00%						21.00%	24.50%	35.00%	35.00%
Non-cash adjustment to income tax expense											$ 805,000
Reduction in income tax provision									$ 1,100,000
Deferred tax asset	3,900,000									$ 3,900,000	3,900,000
Decrease in uncertain tax positions												$ 264,000
Effective tax rate impact on prior year tax position												177,000
Unrecognized tax benefits	0				0				$ 254,000	0	0	0	$ 254,000
Interest and penalties											0	0
Domestic Country
Income Taxes [Line Items]
Net operating loss (NOL) carryforwards	$ 83,500,000				0					$ 83,500,000	$ 83,500,000	$ 0
Minimum [Member] | State And Local Jurisdiction
Income Taxes [Line Items]
Operating loss carry forwards expiration year											2,029
Maximum [Member] | State And Local Jurisdiction
Income Taxes [Line Items]
Operating loss carry forwards expiration year											2,032
British Virgin Islands [Member]
Income Taxes [Line Items]
Net tax benefit					$ 1,800,000

Income Taxes - Summary of Tax R

Income Taxes - Summary of Tax Rates (Detail)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Federal tax provision	35.00%	21.00%	24.50%	35.00%	35.00%
State taxes, net of federal effect			4.10%	4.40%	3.60%
Worthless stock deduction				(4.80%)
Stock based compensation			(2.00%)	0.20%	(0.50%)
Valuation allowance			(0.30%)	(0.10%)	(3.20%)
Foreign rate differential				2.40%	0.50%
Effect of Federal Tax Reform			1.50%
Other			(1.60%)	0.60%	(0.30%)
Effective tax rate			26.20%	37.70%	35.10%

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Asset (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Deferred tax assets:
Inventories	$ 588	$ 1,028
Accrued expenses	644	521
Stock based compensation	2,258	4,121
Tax loss carryforwards	3,910	3,901
Other	580	593
Valuation allowance	(119)	(246)
Total long-term deferred tax assets	7,861	9,918
Deferred tax liabilities:
Depreciation and amortization	(4,453)	(1,149)
Total long-term deferred tax liabilities	(4,453)	(1,149)
Net deferred tax assets	$ 3,408	$ 8,769

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail)	12 Months Ended
	Sep. 30, 2017USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at the beginning of the year	$ 254,000
Increases in tax positions for prior years	10,000
Decreases in tax positions for prior years	(264,000)
Unrecognized tax benefits at the end of the year	$ 0

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Aug. 31, 2017
Equity [Abstract]
Shares approved to repurchase			2,000,000
Shares purchased	4,470,731	4,426,487
Aggregate purchase price	$ 75,256,000	$ 74,561,000
Remaining shares available for future purchases under share repurchase program, amount	$ 342,885

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Net proceeds from issuance of common stock under incentive compensation and employee purchase plans	$ 7,683	$ 3,158	$ 2,701

The Incentive Stock Plans - Add

The Incentive Stock Plans - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Jan. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant fair value of options granted		$ 8.42		$ 6.88
Options granted			0
Total intrinsic value of options exercised		$ 6,300,000	$ 1,600,000	$ 3,600,000
Unrecognized compensation costs related to non-vested options		100,000	200,000
Fair value of options vested		$ 1,300,000	$ 2,500,000	$ 200,000
Incentive Stock Plan 2011 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized					2,200,456
Additional common shares authorized	1,000,000
Expiration of Plan 2011		2021-01
Contractual term of plan 2011		10 years
Incentive Stock Plan 2011 [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized	3,200,456
Incentive Stock Plan 2011 [Member] | Subject To Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized		3,000,000
Incentive Stock Plan 2007 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Common stock shares available		200,456
Incentive Stock Plans [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period unrecognized compensation costs related to non-vested options are expected to be recognized		1 year 9 months 18 days	1 year 9 months 18 days

The Incentive Stock Plans - Sum

The Incentive Stock Plans - Summary of Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted, Options Outstanding		0
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Available for Grant, Beginning Balance	1,386,561
Options granted, Shares Available for Grant	(5,000)
Options cancelled/forfeited/expired, Shares Available for Grant	14,750
Restricted stock awards granted, Shares Available for Grant	(341,517)
Restricted stock awards forfeited, Shares Available for Grant	61,925
Additional shares of stock issued, Shares Available for Grant	(69,472)
Shares Available for Grant, Ending Balance	1,047,247	1,386,561
Options Outstanding, Beginning Balance	1,207,504
Options granted, Options Outstanding	5,000
Options cancelled/forfeited/expired, Options Outstanding	(14,750)
Options exercised, Options Outstanding	(586,531)
Options Outstanding, Ending Balance	611,223	1,207,504
Exercisable as of September 30, 2018, Options Outstanding	607,889
Aggregate Intrinsic Value	$ 5,544	$ 5,737
Exercisable as of September 30, 2018, Aggregate Intrinsic Value	$ 5,537
Weighted Average Exercise Price, Beginning Balance	$ 11.81
Options granted, Weighted Average Exercise Price	18.95
Options cancelled/forfeited/expired, Weighted Average Exercise Price	12.27
Options exercised, Weighted Average Exercise Price	11.48
Weighted Average Exercise Price, Ending Balance	12.18	$ 11.81
Exercisable as of September 30, 2018, Weighted Average Exercise Price	$ 12.14
Weighted Average Remaining Contractual Life	4 years 4 months 24 days	5 years 3 months 18 days
Exercisable as of September 30, 2018, Weighted Average Remaining Contractual Life	4 years 4 months 24 days

The Incentive Stock Plans - Wei

The Incentive Stock Plans - Weighted Average Assumptions of Incentive Stock Plans (Detail) - Incentive Stock Plans [Member]	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
Risk-free interest rate	2.70%	1.00%
Volatility	45.40%	48.20%
Expected life	5 years	5 years

Employee Stock Purchase Plan -

Employee Stock Purchase Plan - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 29, 2012	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares issued		27,141,267	26,314,066
Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional common shares authorized	500,000
Common stock available for issuance		1,000,000
Stock Purchase Plan, requisite continuous service		1 year
Annual offerings description		Implementation of up to 20 annual offerings beginning on the first day of October starting in 2008, with each offering terminating on September 30 of the following year.
Closing price of common stock on the first and last day of the offering		85.00%
Percentage not exceeding to periodic payment of purchase price		10.00%
Maximum common stock value purchased by participant annually		$ 25,000
Common stock, shares issued		860,535
1998 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional Common Shares Authorized		52,837

Employee Stock Purchase Plan _2

Employee Stock Purchase Plan - Weighted Average Assumptions of Employee Stock Purchase Plan (Detail) - Stock Purchase Plan [Member]	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	1.50%	0.70%	0.20%
Volatility	49.90%	40.90%	50.90%
Expected life	6 months	6 months	6 months

Restricted Stock Awards - Addit

Restricted Stock Awards - Additional Information (Detail) - Restricted Stock Awards [Member] $ in Millions	12 Months Ended
	Sep. 30, 2018USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested restricted stock awards	$ 6.3
Weighted average period unrecognized compensation costs related to non-vested restricted awards are expected to be recognized	2 years 1 month 6 days
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting periods of restricted stock award	2 years
Percentage of actual amount of award earned based on actual specified performance target met	0.00%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting periods of restricted stock award	4 years
Percentage of actual amount of award earned based on actual specified performance target met	200.00%

Restricted Stock Awards - Restr

Restricted Stock Awards - Restricted Stock Award Activity (Detail) - Restricted Stock Awards [Member]	12 Months Ended
	Sep. 30, 2018$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares/ Units, Non-vested beginning balance | shares	606,543
Shares/ Units, Awards granted | shares	341,517
Shares/ Units, Awards vested | shares	(181,809)
Shares/ Units, Awards forfeited | shares	(61,925)
Shares/ Units, Non-vested ending balance | shares	704,326
Weighted Average Grant Date Fair Value, Non-vested beginning balance | $ / shares	$ 16.53
Weighted Average Grant Date Fair Value, Awards granted | $ / shares	20.13
Weighted Average Grant Date Fair Value, Awards vested | $ / shares	16.55
Weighted Average Grant Date Fair Value, Awards forfeited | $ / shares	17.15
Weighted Average Grant Date Fair Value, Non-vested ending balance | $ / shares	$ 17.61

Net Income Per Share - Basic an

Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - shares	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in calculating basic income per share									22,269,378	23,966,611	24,203,947
Effect of dilutive options and non-vested restricted stock awards									761,284	712,189	616,900
Weighted average common and common equivalent shares used in calculating diluted income per share	23,286,206	23,182,546	22,940,594	22,712,648	23,591,854	25,095,398	25,116,359	24,923,125	23,030,662	24,678,800	24,820,847

Net Income Per Share - Addition

Net Income Per Share - Additional Information (Detail) - shares	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from earnings per share calculation	1,288	18,526	140,521

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Rental expenses of operating leases	$ 8.4	$ 8.3	$ 7.1
Workers compensation insurance policies	$ 1.4

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Future Minimum Lease Payments Under Non-cancelable Operating Leases (Detail) $ in Thousands	Sep. 30, 2018USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,019	$ 7,296
2,020	7,077
2,021	6,077
2,022	4,961
2,023	4,835
Thereafter	25,361
Total	$ 55,607

Employee 401(k) Profit Sharin_2

Employee 401(k) Profit Sharing Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Compensation And Retirement Disclosure [Abstract]
Duration of profit sharing plan	90 days
Introductory period of profit sharing	April 1 or October 1
Employees eligibility age for participating in profit sharing plan	21 years
Total participants contributions in Profit sharing plan	50.00%	25.00%	25.00%
Maximum of each participants compensation	5.00%	5.00%	5.00%
Contribution under the Profit sharing plan	$ 1,900	$ 765	$ 713

Quarterly Financial Data - Summ

Quarterly Financial Data - Summary of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 308,591	$ 361,254	$ 270,605	$ 236,921	$ 250,618	$ 329,809	$ 245,018	$ 226,875	$ 1,177,371	$ 1,052,320	$ 942,050
Cost of sales	229,587	270,567	201,312	177,672	184,292	245,017	183,959	173,737	879,138	787,005	716,022
Gross profit	79,004	90,687	69,293	59,249	66,326	84,792	61,059	53,138	298,233	265,315	226,028
Selling, general, and administrative expenses	62,056	64,089	58,659	50,246	58,593	59,557	54,781	47,095	235,050	220,026	185,776
Income from operations	16,948	26,598	10,634	9,003	7,733	25,235	6,278	6,043	63,183	45,289	40,252
Interest expense	2,022	2,499	2,840	2,542	1,970	1,897	2,045	1,569	9,903	7,481	5,462
Income before income tax provision	14,926	24,099	7,794	6,461	5,763	23,338	4,233	4,474	53,280	37,808	34,790
Income tax provision	3,386	6,723	1,610	2,249	1,852	9,094	1,484	1,831	13,968	14,261	12,208
Net income	$ 11,540	$ 17,376	$ 6,184	$ 4,212	$ 3,911	$ 14,244	$ 2,749	$ 2,643	$ 39,312	$ 23,547	$ 22,582
Net income per share:
Diluted	$ 0.50	$ 0.75	$ 0.27	$ 0.19	$ 0.17	$ 0.57	$ 0.11	$ 0.11	$ 1.71	$ 0.95	$ 0.91
Weighted average number of shares:
Diluted	23,286,206	23,182,546	22,940,594	22,712,648	23,591,854	25,095,398	25,116,359	24,923,125	23,030,662	24,678,800	24,820,847