Summary of Significant Accounting Policies (Policies)	3 Months Ended
Dec. 31, 2021
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. Additionally, beginning with the condensed consolidated financial statements for the three months ended December 31, 2020, the Company has reflected Interior Products as discontinued operations for all periods presented. Unless otherwise noted, amounts and disclosures throughout these Notes to Condensed Consolidated Financial Statements relate to the Company's continuing operations. Certain prior period amounts have been reclassified to conform to current period presentation. The balance sheet as of December 31, 2020 has been presented for a better understanding of the impact of seasonal fluctuations on the Company’s financial condition. On August 11, 2021, the Company’s Board of Directors approved a change in its fiscal year end from September 30 to December 31, which will be effective beginning January 1, 2022, for the year ending December 31, 2022 (the “New Fiscal Year”). This change better aligns the Company’s financial reporting calendar with many of its industry peers and provides internal benefits by shifting the timing of the budgeting, physical inventory, and performance review cycles away from the Company’s busiest time of year. As such, this Transition Report on Form 10-Q represents the unaudited financial statements for the period from October 1, 2021 to December 31, 2021 (the "transition period" or "three months ended December 31, 2021"). Any references to fiscal year refer to the Company’s fiscal year prior to the transition period, or years ending September 30. Any references to the New Fiscal Year refer to the Company’s fiscal year after the transition period, or years ending December 31. The three-month periods ended December 31, 2021 and 2020 each had 62 business days. In management’s opinion, the condensed consolidated 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 months ended December 31, 2021 are not necessarily indicative of results for any other interim period or for fiscal 2022. These unaudited condensed consolidated financial statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto contained in the Company’s most recent Annual Report on Form 10-K for the fiscal year ended September 30, 2021.
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 condensed 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. Assumptions made in the development of these estimates contemplate the impact of the novel coronavirus (“COVID‑19”) on the economy and the Company’s anticipated results. Actual amounts could differ materially from these estimates.
Business Combinations	Business Combinations The Company records acquisitions resulting in the consolidation of a business using the acquisition method of accounting. Under this method, the Company records the assets acquired, including intangible assets that can be identified and named, and liabilities assumed based on their estimated fair values at the date of acquisition. The Company uses an income approach to determine the fair value of acquired intangible assets, specifically the multi-period excess earnings method for customer relationships and the relief from royalty method for trade names. Various Level 3 fair value assumptions are used in the determination of these estimated fair values, including items such as sales growth rates, cost synergies, customer attrition rates, discount rates, and other prospective financial information. The purchase price in excess of the fair value of the assets acquired and liabilities assumed is recorded as goodwill. Estimates associated with the accounting for acquisitions may change as additional information becomes available regarding the assets acquired and liabilities assumed. Transaction costs associated with acquisitions are expensed as incurred.
Recent Accounting Pronouncements - Adopted and Not Yet Adopted	Recent Accounting Pronouncements—Adopted In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“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 became effective for the Company on October 1, 2020. The adoption of the new standard was done using the modified-retrospective approach, through a cumulative-effect adjustment to retained earnings as of October 1, 2020. The most significant effect of the standard was an increase to the Company’s accounts receivable reserve and a corresponding retained earnings adjustment of approximately $4.3 million on October 1, 2020. Recent Accounting Pronouncements—Not Yet Adopted In October 2021, the FASB issued ASU 2021-08, “Business Combinations – Accounting for Contract Assets and Contract Liabilities from Contracts with Customers.” The guidance is intended to improve the accounting for acquired revenue contracts with customers in a business combination by addressing diversity in practice. The guidance requires an acquirer to recognize and measure contract assets and liabilities acquired in a business combination in accordance with Topic 606 as if they had originated the contracts, as opposed to at fair value on the acquisition date. The standard will be effective for business combinations that occur after January 1, 2023. Early adoption is permitted. The guidance will be applied prospectively to acquisitions occurring on or after the effective date. The Company will continue to evaluate the impact of this guidance, which would depend on the contract assets and liabilities assumed in any future business combinations. In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The guidance provides optional practical expedients to ease the potential burden in accounting for contract modifications and hedge accounting related to reference rate reform. In January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848), Scope,” to clarify the scope of the guidance and reduce potential diversity in practice. The standard is effective as of March 12, 2020 through December 31, 2022. However, the standard is not applicable to contract modifications made, and hedging relationships entered into or evaluated after, December 31, 2022. The Company will evaluate and disclose the impact of this guidance in the period of election, as well as the nature and reason for doing so.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Dec. 31, 2021

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. Additionally, beginning with the condensed consolidated financial statements for the three months ended December 31, 2020, the Company has reflected Interior Products as discontinued operations for all periods presented. Unless otherwise noted, amounts and disclosures throughout these Notes to Condensed Consolidated Financial Statements relate to the Company's continuing operations. Certain prior period amounts have been reclassified to conform to current period presentation.

The balance sheet as of December 31, 2020 has been presented for a better understanding of the impact of seasonal fluctuations on the Company’s financial condition.

On August 11, 2021, the Company’s Board of Directors approved a change in its fiscal year end from September 30 to December 31, which will be effective beginning January 1, 2022, for the year ending December 31, 2022 (the “New Fiscal Year”). This change better aligns the Company’s financial reporting calendar with many of its industry peers and provides internal benefits by shifting the timing of the budgeting, physical inventory, and performance review cycles away from the Company’s busiest time of year. As such, this Transition Report on Form 10-Q represents the unaudited financial statements for the period from October 1, 2021 to December 31, 2021 (the "transition period" or "three months ended December 31, 2021"). Any references to fiscal year refer to the Company’s fiscal year prior to the transition period, or years ending September 30. Any references to the New Fiscal Year refer to the Company’s fiscal year after the transition period, or years ending December 31. The three-month periods ended December 31, 2021 and 2020 each had 62 business days.

In management’s opinion, the condensed consolidated 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 months ended December 31, 2021 are not necessarily indicative of results for any other interim period or for fiscal 2022.

These unaudited condensed consolidated financial statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto contained in the Company’s most recent Annual Report on Form 10-K for the fiscal year ended September 30, 2021.

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 condensed 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. Assumptions made in the development of these estimates contemplate the impact of the novel coronavirus (“COVID‑19”) on the economy and the Company’s anticipated results. Actual amounts could differ materially from these estimates.

Business Combinations

The Company records acquisitions resulting in the consolidation of a business using the acquisition method of accounting. Under this method, the Company records the assets acquired, including intangible assets that can be identified and named, and liabilities assumed based on their estimated fair values at the date of acquisition. The Company uses an income approach to determine the fair value of acquired intangible assets, specifically the multi-period excess earnings method for customer relationships and the relief from royalty method for trade names. Various Level 3 fair value assumptions are used in the determination of these estimated fair values, including items such as sales growth rates, cost synergies, customer attrition rates, discount rates, and other prospective financial information. The purchase price in excess of the fair value of the assets acquired and liabilities assumed is recorded as goodwill. Estimates associated with the accounting for acquisitions may change as additional information becomes available regarding the assets acquired and liabilities assumed. Transaction costs associated with acquisitions are expensed as incurred.

Recent Accounting Pronouncements - Adopted and Not Yet Adopted

Recent Accounting Pronouncements—Adopted

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“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 became effective for the Company on October 1, 2020. The adoption of the new standard was done using the modified-retrospective approach, through a cumulative-effect adjustment to retained earnings as of October 1, 2020. The most significant effect of the standard was an increase to the Company’s accounts receivable reserve and a corresponding retained earnings adjustment of approximately $4.3 million on October 1, 2020.

Recent Accounting Pronouncements—Not Yet Adopted

In October 2021, the FASB issued ASU 2021-08, “Business Combinations – Accounting for Contract Assets and Contract Liabilities from Contracts with Customers.” The guidance is intended to improve the accounting for acquired revenue contracts with customers in a business combination by addressing diversity in practice. The guidance requires an acquirer to recognize and measure contract assets and liabilities acquired in a business combination in accordance with Topic 606 as if they had originated the contracts, as opposed to at fair value on the acquisition date. The standard will be effective for business combinations that occur after January 1, 2023. Early adoption is permitted. The guidance will be applied prospectively to acquisitions occurring on or after the effective date. The Company will continue to evaluate the impact of this guidance, which would depend on the contract assets and liabilities assumed in any future business combinations.

In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The guidance provides optional practical expedients to ease the potential burden in accounting for contract modifications and hedge accounting related to reference rate reform. In January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848), Scope,” to clarify the scope of the guidance and reduce potential diversity in practice. The standard is effective as of March 12, 2020 through December 31, 2022. However, the standard is not applicable to contract modifications made, and hedging relationships entered into or evaluated after, December 31, 2022. The Company will evaluate and disclose the impact of this guidance in the period of election, as well as the nature and reason for doing so.