Long-Term Debt (Details) - USD ($) $ in Thousands	1 Months Ended			9 Months Ended
	Feb. 25, 2021	Mar. 31, 2020	Apr. 30, 2019	Oct. 01, 2021	Sep. 30, 2020	Mar. 31, 2019
Long-Term Debt (Details) [Line Items]
Repayment of existing debt				$ 294,463	$ 212,170
Credit agreement, description	On February 25, 2021, Atlas Intermediate, as the borrower, entered into two new credit facilities consisting of (i) a $432.0 million senior secured term loan at closing and, subject to the satisfaction of certain terms and conditions, a committed delayed draw term loan facility to be used for future acquisitions, within 18 month of February 25, 2021 and subject to certain conditions, in an aggregate principal amount of up to $75.0 million, of which $35 million has been used and $40 million remains available as of October 1, 2021, and an uncommitted incremental term loan facility that may be incurred after closing (the “Term Loan”) pursuant to a Credit Agreement dated February 25, 2021, by and among Holdings, Atlas Intermediate, Wilmington Trust, National Association, as administrative agent and collateral agent, and certain lenders thereto, including certain Blackstone entities, which may include, Blackstone Alternative Credit Advisors LP, and its managed funds and accounts, and its affiliates, Blackstone Holdings Finance Co.			The Term Loan Agreement contains a financial covenant which requires Holdings, Atlas Intermediate and all of their direct and indirect subsidiaries on a consolidated basis to maintain a Total Net Leverage Ratio (as defined in each Credit Agreement) tested on a quarterly basis that does not exceed (i) 8.25 to 1.00 with respect to the fiscal quarters ending on April 2, 2021 and July 2, 2021, (ii) 8.00 to 1.00 for the fiscal quarters ending October 1, 2021 and December 31, 2021, (iii) 7.50 to 1.00 for the fiscal quarters ending April 1, 2022 and July 1, 2022, (iv) 7.25 to 1.00 for the fiscal quarters ending September 30, 2022 and December 30, 2022, (v) 7.00 to 1.00 for the fiscal quarters ending March 31, 2023 and June 30, 2023, (vi) 6.75 to 1.00 for the fiscal quarters ending September 29, 2023 and December 29, 2023, and (vii) 6.50 to 1.00 for March 29, 2024 and each fiscal quarter ending thereafter.
Term loan agreement, description	L.L.C. and its affiliates, and/or certain other of their respective funds, accounts, clients managed, advised or sub-advised, or any of their respective affiliates (the “Term Loan Agreement”) and (ii) a $40.0 million senior secured revolver which aggregate principal amount may be increased, subject to the satisfaction of certain terms and conditions, including obtaining commitments therefor, by up to $20,000,000 (the “Revolver”) pursuant to the Credit Agreement dated February 25, 2021, by and among Holdings, Intermediate, JPMorgan Chase Bank, N.A., as administrative agent, swingline lender, issuing bank, lender, sole bookrunner and sole lead arranger (the “ABL Revolver Agreement,” and together with the Term Loan Agreement, collectively the “Credit Agreements”).			(i) the Adjusted LIBO Rate (as defined in the Term Loan Agreement), plus 5.50%, or (ii) an Alternate Base Rate (as defined in the Term Loan Agreement), plus 4.50%. In addition, the term loan requires an additional 2.0% interest that can be made at the option of the Company in cash or payment-in-kind (PIK). The interest rates under the ABL Revolver Agreement will be equal to either (i) the Adjusted LIBO Rate (as defined in the ABL Revolver Agreement), plus 2.50%, or (ii) the ABR (as defined in the ABL Revolver Agreement), plus 1.50%.
Revolver agreement, description				The ABL Revolver Agreement contains a “springing” financial covenant which requires Holdings, Intermediate and all their direct and indirect subsidiaries on a consolidated basis to maintain a Fixed Charge Coverage Ratio (as defined in the ABL Revolver Agreement) of no less than 1.10 to 1.00 when the outstanding principal amount of loans under the Revolver exceeds $0 or the aggregate exposure for letters of credit under the Revolver exceeds $5 million.
Deferred loan acquisition costs	$ 15,200
Atlas [Member]
Long-Term Debt (Details) [Line Items]
Business combination, description				The Atlas Credit Agreement called for a term loan (the “Term Loan”) in the amount of $281.0 million and revolving letter of credit (the “Revolver”) in the amount of $40.0 million of which $24.0 million was drawn upon through December 31, 2020. The term loan proceeds were used to repay the existing Atlas Credit Facility in the amount of $171.0 million and partially fund the Atlas Business Combination and the LONG acquisition.
ATC [Member]
Long-Term Debt (Details) [Line Items]
Term loan						$ 145,000
Revolving credit facility						50,000
Credit facility funded at closing						$ 31,800
Repayment of existing debt			$ 123,900
Shareholder distribution			$ 52,800
Credit facility interest terms, description				The Atlas Credit Facility was secured by assets of Atlas Intermediate. The Atlas Credit Facility required quarterly principal payments of $2.719 million through March 31, 2023, and then $3.625 million until the final maturity in March 2024, and bore interest at an annual rate of LIBOR plus a margin ranging from 275 to 425 basis points determined by the Company’s Consolidated Leverage Ratio, as defined in the Atlas Credit Facility. For the interest payment made in the quarter ended December 31, 2019, the applicable margin was 375 basis points and the total interest rate was 5.50%.
Credit agreement, description		the terms of the Atlas Credit Agreement were modified to reduce the maturity of the Term Loan by one year to February 14, 2026 from February 14, 2027. The interest rate for the Term Loan was increased to (i) Adjusted LIBOR as defined in the Atlas Credit Agreement, plus 6.25%, or (ii) an Alternate Base Rate as defined in the Atlas Credit Agreement, plus 5.25%. The interest rate for the Revolver was increased to (i) Adjusted LIBOR as defined in the Atlas Credit Agreement, plus 5.0%, or (ii) an Alternate Base Rate as defined in the Credit Agreement, plus 4.0%. The modification also increased the rate of amortization applicable to the Term Loan to 5.0% per annum (commencing on June 30, 2020).		Under the terms of the Atlas Credit Agreement, the Term Loan and Revolver were set to mature on February 14, 2027 and February 14, 2025, respectively. Interest was payable monthly or at the end of the applicable interest period in arrears on any outstanding borrowings. The interest rates under the Atlas Credit Agreement were equal to either (i) Adjusted LIBOR as defined in the Atlas Credit Agreement, plus 4.75%, or (ii) an Alternate Base Rate as defined in the Atlas Credit Agreement, plus 3.75%.
Long term debt, description				The 2021 Atlas Credit agreement requires annual amortization of principal and interest paid in kind amounts of 1% or 2.5% depending on certain ratios. The Company is currently within the ratio that requires 1% annual amortization. Principal repayments commence during the Company’s second quarter 2022.
ETS [Member]
Long-Term Debt (Details) [Line Items]
Maturity date description				The modifications to the Atlas Credit Agreement resulted from the exercise of the market-flex rights by the lead arranger in connection with the syndication process, which, in addition, required the payment of an upfront fee in an amount equal to 2% of the currently outstanding Term Loans, which was paid during April 2020.
Initial Term Loan [Member]
Long-Term Debt (Details) [Line Items]
Mature date				Feb. 25, 2028
Revoler [Member]
Long-Term Debt (Details) [Line Items]
Mature date				Feb. 25, 2028