Summary of Significant Accounting Policies (Policies)	6 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Company prepared the condensed consolidated financial statements in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the requirements of the Securities and Exchange Commission (“SEC”). As permitted under those rules, certain footnotes or other financial information have been condensed or omitted. Certain prior period amounts have been reclassified to conform to current period presentation. The balance sheet as of March 31, 2018 has been presented for a better understanding of the impact of seasonal fluctuations on the Company’s financial condition. In management’s opinion, the financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of the Company’s financial position and operating results. The results for the three and six months ended March 31, 2019 are not necessarily indicative of the results to be expected for the twelve months ending September 30, 2019 (“fiscal year 2019” or “2019”). The three-month periods ended March 31, 2019 and 2018 had 63 and 64 business days, respectively, and the six-month periods ended March 31, 2019 and 2018 each had 125 business days. These interim Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto contained in the Company’s fiscal year 2018 (“2018”) Annual Report on Form 10-K for the year ended September 30, 2018.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in these consolidated financial statements and accompanying notes. Significant items subject to such estimates include accounts receivable, inventories, purchase price allocations, goodwill and intangibles, and income taxes. Actual amounts could differ from those estimates.
Recent Accounting Pronouncements - Adopted and Not Yet Adopted	Recent Accounting Pronouncements—Adopted In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” This guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers and replaces most previously issued revenue recognition guidance. The new standard is effective for public business entities for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2017. The standard permits the use of either the full retrospective or modified retrospective adoption methods. The Company elected the modified retrospective method and adopted the standard as of October 1, 2018 utilizing the portfolio practical expedient. The adoption of this guidance did not impact the Company’s retained earnings and did not have a material impact on the Company’s net sales recognition practices, income from operations, or net income per share amounts. The adoption of this guidance did result in certain balance sheet reclassifications to record estimated customer returns, specifically the recognition of a current liability for the gross amount of estimated returns and a current asset for the value of the related products. These reclassifications did not have a material impact on the Company’s consolidated balance sheet as of March 31, 2019. In addition, the adoption of this guidance resulted in additional quantitative disclosures to disaggregate net sales balances by product line and geography. See Note 4 to the Consolidated Financial Statements for further discussion. In January 2017, the FASB issued ASU 2017-01, “Business Combinations: Clarifying the Definition of a Business.” This guidance is intended to assist entities when evaluating when a set of transferred assets and activities constitutes a business. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2017. The Company adopted the standard as of October 1, 2018 and the standard did not have a material impact on the Company’s financial statement and related disclosures. In May 2017, the FASB issued ASU 2017-09, “Scope of Modification Accounting.” This guidance is intended to provide clarity and reduce both diversity in practice and cost and complexity when applying the guidance in Compensation – Stock Compensation, to a change to the terms or conditions of a share-based payment award. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2017. The Company adopted the standard as of October 1, 2018 and the standard did not have a material impact on the Company’s financial statement and related disclosures. Recent Accounting Pronouncements—Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, “Leases.” This guidance will replace most existing accounting for lease guidance when it becomes effective. This new standard is effective using the modified retrospective approach for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2018, and early adoption is permitted. In July 2018, the FASB amended the new lease standard which, among other changes, allows a company to elect to adopt ASU 2016-02 using a transition option whereby a cumulative effect adjustment is recorded to the opening balance of its retained earnings on the adoption date. The guidance will require the Company to record a right of use asset and a lease liability for most of the Company’s leases, including those currently treated as operating leases. The Company will adopt the standard as of October 1, 2019 and will use the practical expedients outlined in the transition guidance. The scope of the overall impact on the Company’s financial statements and related disclosures is still being quantified. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments.” This guidance is intended to introduce a revised approach to the recognition and measurement of credit losses, emphasizing an updated model based on expected losses rather than incurred losses. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2019, and early adoption is permitted. The Company is currently evaluating the impact that this guidance may have on its financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, “Simplifying the Accounting for Goodwill Impairment.” This guidance is intended to introduce a simplified approach to measurement of goodwill impairment, eliminating the need for a hypothetical purchase price allocation and instead measuring impairment by the amount a reporting unit’s carrying value exceeds its fair value. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2019, and early adoption is permitted. The Company does not expect the adoption of this new guidance to have a material impact on its financial statements and related disclosures. In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income.” This guidance is intended to address the accounting treatment for the tax effects on items within accumulated other comprehensive income as a result of the adoption of the Tax Cuts and Jobs Act of 2017. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2018, and early adoption is permitted. The Company does not expect the adoption of this new guidance to have a material impact on its financial statements and related disclosures.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Mar. 31, 2019

The Company prepared the condensed consolidated financial statements in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the requirements of the Securities and Exchange Commission (“SEC”). As permitted under those rules, certain footnotes or other financial information have been condensed or omitted. Certain prior period amounts have been reclassified to conform to current period presentation. The balance sheet as of March 31, 2018 has been presented for a better understanding of the impact of seasonal fluctuations on the Company’s financial condition.

In management’s opinion, the financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of the Company’s financial position and operating results. The results for the three and six months ended March 31, 2019 are not necessarily indicative of the results to be expected for the twelve months ending September 30, 2019 (“fiscal year 2019” or “2019”).

The three-month periods ended March 31, 2019 and 2018 had 63 and 64 business days, respectively, and the six-month periods ended March 31, 2019 and 2018 each had 125 business days.

These interim Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto contained in the Company’s fiscal year 2018 (“2018”) Annual Report on Form 10-K for the year ended September 30, 2018.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in these consolidated financial statements and accompanying notes. Significant items subject to such estimates include accounts receivable, inventories, purchase price allocations, goodwill and intangibles, and income taxes. Actual amounts could differ from those estimates.

Recent Accounting Pronouncements - Adopted and Not Yet Adopted

Recent Accounting Pronouncements—Adopted

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” This guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers and replaces most previously issued revenue recognition guidance. The new standard is effective for public business entities for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2017. The standard permits the use of either the full retrospective or modified retrospective adoption methods. The Company elected the modified retrospective method and adopted the standard as of October 1, 2018 utilizing the portfolio practical expedient. The adoption of this guidance did not impact the Company’s retained earnings and did not have a material impact on the Company’s net sales recognition practices, income from operations, or net income per share amounts. The adoption of this guidance did result in certain balance sheet reclassifications to record estimated customer returns, specifically the recognition of a current liability for the gross amount of estimated returns and a current asset for the value of the related products. These reclassifications did not have a material impact on the Company’s consolidated balance sheet as of March 31, 2019. In addition, the adoption of this guidance resulted in additional quantitative disclosures to disaggregate net sales balances by product line and geography. See Note 4 to the Consolidated Financial Statements for further discussion.

In January 2017, the FASB issued ASU 2017-01, “Business Combinations: Clarifying the Definition of a Business.” This guidance is intended to assist entities when evaluating when a set of transferred assets and activities constitutes a business. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2017. The Company adopted the standard as of October 1, 2018 and the standard did not have a material impact on the Company’s financial statement and related disclosures.

In May 2017, the FASB issued ASU 2017-09, “Scope of Modification Accounting.” This guidance is intended to provide clarity and reduce both diversity in practice and cost and complexity when applying the guidance in Compensation – Stock Compensation, to a change to the terms or conditions of a share-based payment award. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2017. The Company adopted the standard as of October 1, 2018 and the standard did not have a material impact on the Company’s financial statement and related disclosures.

Recent Accounting Pronouncements—Not Yet Adopted

In February 2016, the FASB issued ASU 2016-02, “Leases.” This guidance will replace most existing accounting for lease guidance when it becomes effective. This new standard is effective using the modified retrospective approach for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2018, and early adoption is permitted. In July 2018, the FASB amended the new lease standard which, among other changes, allows a company to elect to adopt ASU 2016-02 using a transition option whereby a cumulative effect adjustment is recorded to the opening balance of its retained earnings on the adoption date. The guidance will require the Company to record a right of use asset and a lease liability for most of the Company’s leases, including those currently treated as operating leases. The Company will adopt the standard as of October 1, 2019 and will use the practical expedients outlined in the transition guidance. The scope of the overall impact on the Company’s financial statements and related disclosures is still being quantified.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments.” This guidance is intended to introduce a revised approach to the recognition and measurement of credit losses, emphasizing an updated model based on expected losses rather than incurred losses. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2019, and early adoption is permitted. The Company is currently evaluating the impact that this guidance may have on its financial statements and related disclosures.

In January 2017, the FASB issued ASU 2017-04, “Simplifying the Accounting for Goodwill Impairment.” This guidance is intended to introduce a simplified approach to measurement of goodwill impairment, eliminating the need for a hypothetical purchase price allocation and instead measuring impairment by the amount a reporting unit’s carrying value exceeds its fair value. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2019, and early adoption is permitted. The Company does not expect the adoption of this new guidance to have a material impact on its financial statements and related disclosures.

In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income.” This guidance is intended to address the accounting treatment for the tax effects on items within accumulated other comprehensive income as a result of the adoption of the Tax Cuts and Jobs Act of 2017. This new standard is effective for annual reporting periods, and interim reporting periods contained therein, beginning after December 15, 2018, and early adoption is permitted. The Company does not expect the adoption of this new guidance to have a material impact on its financial statements and related disclosures.